![The Hubble Space Telescope](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Hubble.jpg)
The Hubble Space Telescope
![The International Space Station](https://img.sciencehelpdesk.com/thumbs/images/science1_1_InternationalSpaceStation.jpg)
The International Space Station
![Repairing the IIS](https://img.sciencehelpdesk.com/thumbs/images/science1_1_IISRepairs.jpg)
Repairing the IIS
![The IIS, the Earth and the Moon](https://img.sciencehelpdesk.com/thumbs/images/science1_1_IISMoonEarthNasa.jpg)
The IIS, the Earth and the Moon
![Robot arm over Earth with sunburst](https://img.sciencehelpdesk.com/thumbs/images/science1_1_RobotArmOverEarthWithSunburst.jpg)
Robot arm over Earth with sunburst
![Space shuttle Discovery](https://img.sciencehelpdesk.com/thumbs/images/science1_1_DiscoverySpaceShuttle1.jpg)
Space shuttle Discovery
![Space shuttle Endeavour (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ShuttleEndeavour.jpg)
Space shuttle Endeavour (I)
![Space shuttle Endeavour (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SpaceShuttleEndeavourII.jpg)
Space shuttle Endeavour (II)
![Phoenix spaceprobe descending to Mars on 25 may 2008](https://img.sciencehelpdesk.com/thumbs/images/science1_1_PhoenixDescendingToMars.jpg)
Phoenix spaceprobe descending to Mars on 25 may 2008
![Milky Way](https://img.sciencehelpdesk.com/thumbs/images/science1_1_GalaxyMilkyWay.jpg)
Milky Way
![Milky Way and Jupiter](https://img.sciencehelpdesk.com/thumbs/images/science1_1_MilkyWayAndJupiter.jpg)
Milky Way and Jupiter
![Spiral galaxy NGC 4414](https://img.sciencehelpdesk.com/thumbs/images/science1_1_GalaxySpiralNGC4414.jpg)
Spiral galaxy NGC 4414
![Barred spiral galaxy NGC1300](https://img.sciencehelpdesk.com/thumbs/images/science1_1_GalaxyBarredSpiralNGC1300.jpg)
Barred spiral galaxy NGC1300
![Galaxy system Arp-87](https://img.sciencehelpdesk.com/thumbs/images/science1_1_GalaxySystemArp87.jpg)
Galaxy system Arp-87
![Galactic collision](https://img.sciencehelpdesk.com/thumbs/images/science1_1_GalacticCollision.jpg)
Galactic collision
![Cluster of galaxies Abell 1689](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ClusterGalaxiesAbell1689Nasa.jpg)
Cluster of galaxies Abell 1689
![Cluster of galaxies](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ClusterGalaxies1.jpg)
Cluster of galaxies
![Orion nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_NebulaOrion.jpg)
Orion nebula
![Carina nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_CarinaNebula.jpg)
Carina nebula
![Eagle nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_NebulaEagle.jpg)
Eagle nebula
![Crab nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_NebulaCrab.jpg)
Crab nebula
![Veil nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_VeilNebula.jpg)
Veil nebula
![Homunculus nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_HomunculusNebula.jpg)
Homunculus nebula
![God's eye nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_NebulaGodsEye.jpg)
God's eye nebula
![God's hand nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ManoDeDiosByNuSTAR-NASA.jpg)
God's hand nebula
![Remnants of the supernova SN1006 (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SN1006SupernovaRemnantI.jpg)
Remnants of the supernova SN1006 (I)
![Remnants of the supernova SN1006 (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SN1006SupernovaRemnantII.jpg)
Remnants of the supernova SN1006 (II)
![The Pillars of Creation: star formation in the Eagle Nebula](https://img.sciencehelpdesk.com/thumbs/images/science1_1_PillarsCreation.jpg)
The Pillars of Creation: star formation in the Eagle Nebula
![Star formation in the Large Magellanic Cloud](https://img.sciencehelpdesk.com/thumbs/images/science1_1_LargeMagellanicCloud.jpg)
Star formation in the Large Magellanic Cloud
![The Cosmos Middle Finger: is God angry with us?](https://img.sciencehelpdesk.com/thumbs/images/science1_1_CosmosMiddleFinger.jpg)
The Cosmos Middle Finger: is God angry with us?
![Constellation of Orion](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ConstellationOrion1.jpg)
Constellation of Orion
![How black holes swallow stars](https://img.sciencehelpdesk.com/thumbs/images/science1_1_black-hole-swallows-star.gif)
How black holes swallow stars
![The Sun](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Sun.jpg)
The Sun
![Spots on Sun's surface](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SunSpots.jpg)
Spots on Sun's surface
![Solar storm of magnetic plasma taken by the SOHO space probe](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SunStormMagneticPlasmaSoho.jpg)
Solar storm of magnetic plasma taken by the SOHO space probe
![Multiple visions of the Sun from the SDO spacecraft (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SDO1.jpg)
Multiple visions of the Sun from the SDO spacecraft (I)
![Multiple visions of the Sun from the SDO spacecraft (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SDO2.jpg)
Multiple visions of the Sun from the SDO spacecraft (II)
![Total solar eclipse](https://img.sciencehelpdesk.com/thumbs/images/science1_1_TotalSolarEclipseI.jpg)
Total solar eclipse
![Total solar eclipse from space](https://img.sciencehelpdesk.com/thumbs/images/science1_1_TotalSolarEclipseII.jpg)
Total solar eclipse from space
![Sun's radiation spectrum](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ElectromagneticSpectrum2.gif)
Sun's radiation spectrum
![Asteroid Vesta from Dawn spacecraft](https://img.sciencehelpdesk.com/thumbs/images/science1_1_VestaFromDawn.jpg)
Asteroid Vesta from Dawn spacecraft
![Asteroid Mathilde](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Mathilde.jpg)
Asteroid Mathilde
![Comets' pathway](https://img.sciencehelpdesk.com/thumbs/images/science1_1_CometPath.jpg)
Comets' pathway
![Comets' tails (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_CometTails1.jpg)
Comets' tails (I)
![Comets' tails (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_CometTails2.jpg)
Comets' tails (II)
![Comet Halley in 1910](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Halley1910.jpg)
Comet Halley in 1910
![Comet Hale-Bopp](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Hale-Bopp.jpg)
Comet Hale-Bopp
![Comet Hale-Bopp and Aurora Borealis](https://img.sciencehelpdesk.com/thumbs/images/science1_1_HaleBoppAurora.jpg)
Comet Hale-Bopp and Aurora Borealis
![Solar System's planets and dwarf planets](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SolarSystemPlanets.jpg)
Solar System's planets and dwarf planets
![The rocky planets and some moons](https://img.sciencehelpdesk.com/thumbs/images/science1_1_RockyPlanetsandMoons.jpg)
The rocky planets and some moons
![The gaseous planets compared to the Earth](https://img.sciencehelpdesk.com/thumbs/images/science1_1_GaseousPlanetsandEarth.jpg)
The gaseous planets compared to the Earth
![Venus near the Moon](https://img.sciencehelpdesk.com/thumbs/images/science1_1_VenusMoon.jpg)
Venus near the Moon
![Venus](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Venus.jpg)
Venus
![Mars](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Mars.jpg)
Mars
![Mars seen from the Rosetta spaceprobe](https://img.sciencehelpdesk.com/thumbs/images/science1_1_MarsFromRosetta.jpg)
Mars seen from the Rosetta spaceprobe
![Sunset in Mars](https://img.sciencehelpdesk.com/thumbs/images/science1_1_MarsSunset.jpg)
Sunset in Mars
![Victoria crater in Mars, taken by the Opportunity rover](https://img.sciencehelpdesk.com/thumbs/images/science1_1_MarsVictoriaCraterOpportunity.jpg)
Victoria crater in Mars, taken by the Opportunity rover
![Water on Mars?](https://img.sciencehelpdesk.com/thumbs/images/science1_1_MarsWater.jpg)
Water on Mars?
![Mars' moon Phobos](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Phobos.jpg)
Mars' moon Phobos
![Jupiter's atmosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_1_JupiterAtmosphere.jpg)
Jupiter's atmosphere
![Surface of Jupiter's moon Europa from the Galileo spaceprobe](https://img.sciencehelpdesk.com/thumbs/images/science1_1_JupiterEuropaGalileoNasa.jpg)
Surface of Jupiter's moon Europa from the Galileo spaceprobe
![Aurora borealis in Saturn](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SaturnAurora.jpg)
Aurora borealis in Saturn
![Saturn seen from the Cassini spaceprobe (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Saturn1.jpg)
Saturn seen from the Cassini spaceprobe (I)
![Saturn seen from the Cassini spaceprobe (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Saturn3.jpg)
Saturn seen from the Cassini spaceprobe (II)
![2000 km across hurricane in Saturn's north pole, from the Cassini spaceprobe](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SaturnNorthPoleHurricaneCassini.png)
2000 km across hurricane in Saturn's north pole, from the Cassini spaceprobe
![Saturn's moon Rhea](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SaturnRhea.jpg)
Saturn's moon Rhea
![Saturn's moon Iapetus from the Cassini spaceprobe](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SaturnIapetusCassini.jpg)
Saturn's moon Iapetus from the Cassini spaceprobe
![Solstices and equinoxes](https://img.sciencehelpdesk.com/thumbs/images/science1_1_SolsticesEquinoxes.gif)
Solstices and equinoxes
![Aurora Borealis seen from the space](https://img.sciencehelpdesk.com/thumbs/images/science1_1_AuroraBorealisFromSpace1.jpg)
Aurora Borealis seen from the space
![The Earth and the Moon](https://img.sciencehelpdesk.com/thumbs/images/science1_1_EarthMoon.jpg)
The Earth and the Moon
![The Earth and the Moon from Mars](https://img.sciencehelpdesk.com/thumbs/images/science1_1_EarthMoonFromMars.jpg)
The Earth and the Moon from Mars
![Earth setting down from the Moon](https://img.sciencehelpdesk.com/thumbs/images/science1_1_EarthSetFromMoon.jpg)
Earth setting down from the Moon
![Impact crater in the Sahara Desert](https://img.sciencehelpdesk.com/thumbs/images/science1_1_ImpactCrater.jpg)
Impact crater in the Sahara Desert
![A day in the arctic summer](https://img.sciencehelpdesk.com/thumbs/images/science1_1_a-day-in-arctic-summer.gif)
A day in the arctic summer
![The Moon](https://img.sciencehelpdesk.com/thumbs/images/science1_1_Moon.jpg)
The Moon
![The Moon's phases](https://img.sciencehelpdesk.com/thumbs/images/science1_1_MoonPhases.gif)
The Moon's phases
![Total lunar eclipse](https://img.sciencehelpdesk.com/thumbs/images/science1_1_TotalLunarEclipse.jpg)
Total lunar eclipse
![Chemical composition of the Earth's atmosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmosphereComposition.gif)
Chemical composition of the Earth's atmosphere
![Structure of the Earth's atmosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmosphereStructure1.jpg)
Structure of the Earth's atmosphere
![Variations of temperature in the Earth's atmosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmosphereTemperature.gif)
Variations of temperature in the Earth's atmosphere
![Atmosphere's density and pressure](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmosphereColumn2.gif)
Atmosphere's density and pressure
![Atmosphere's pressure and Torricelli's experiment](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmospherePressure1.gif)
Atmosphere's pressure and Torricelli's experiment
![Water vapour in the Earth's atmosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmosphericWaterVaporMean.jpg)
Water vapour in the Earth's atmosphere
![Sun's radiation spectrum (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_3_ElectromagneticSpectrum1.gif)
Sun's radiation spectrum (I)
![Sun's radiation spectrum (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_3_ElectromagneticSpectrum2.gif)
Sun's radiation spectrum (II)
![Sun radiations in sunrise and sunset](https://img.sciencehelpdesk.com/thumbs/images/science1_3_SunsetColor.jpg)
Sun radiations in sunrise and sunset
![Snow flakes](https://img.sciencehelpdesk.com/thumbs/images/science1_3_SnowFlakes.gif)
Snow flakes
![Snowflake increasingly magnified up to 36,000 times](https://img.sciencehelpdesk.com/thumbs/images/science1_3_SnowFlake.jpg)
Snowflake increasingly magnified up to 36,000 times
![Air circulation in the atmosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_3_AtmosphereCirculation.jpg)
Air circulation in the atmosphere
![Common types of clouds](https://img.sciencehelpdesk.com/thumbs/images/science1_3_CloudTypes.jpg)
Common types of clouds
![The eye of the hurricane](https://img.sciencehelpdesk.com/thumbs/images/science1_3_HurricaneDean.jpg)
The eye of the hurricane
![Hurricane Ike from the International Space Station](https://img.sciencehelpdesk.com/thumbs/images/science1_3_IkeFromISS.jpg)
Hurricane Ike from the International Space Station
![Formation of cyclones in tandem over Iceland](https://img.sciencehelpdesk.com/thumbs/images/science1_3_IcelandTandemCyclones.jpg)
Formation of cyclones in tandem over Iceland
![Karman vortices over the Pacific ocean](https://img.sciencehelpdesk.com/thumbs/images/science1_3_KarmanVortices.jpg)
Karman vortices over the Pacific ocean
![Anatomy of a tropical cyclone](https://img.sciencehelpdesk.com/thumbs/images/science1_3_TropicalCyclone.jpg)
Anatomy of a tropical cyclone
![Molecules of water](https://img.sciencehelpdesk.com/thumbs/images/science1_4_WaterMolecules.gif)
Molecules of water
![Compartments of the Hydrosphere](https://img.sciencehelpdesk.com/thumbs/images/science1_4_GlobalWater1.gif)
Compartments of the Hydrosphere
![Diagram of the water cycle (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_4_WaterCycle1.gif)
Diagram of the water cycle (I)
![Diagram of the water cycle (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_4_WaterCycle2.jpg)
Diagram of the water cycle (II)
![Diagram of the water cycle (III)](https://img.sciencehelpdesk.com/thumbs/images/science1_4_WaterCycle3.gif)
Diagram of the water cycle (III)
![Diagram of the water cycle (IV)](https://img.sciencehelpdesk.com/thumbs/images/science1_4_WaterCycle4.jpg)
Diagram of the water cycle (IV)
![Lakes and rivers under the Antarctica ice sheet](https://img.sciencehelpdesk.com/thumbs/images/science1_4_AntarcticaWater.jpg)
Lakes and rivers under the Antarctica ice sheet
![Snow caps in the mountains of Tibet](https://img.sciencehelpdesk.com/thumbs/images/science1_4_SnowCapsTibetMountains.jpg)
Snow caps in the mountains of Tibet
![Atmospheric water vapour](https://img.sciencehelpdesk.com/thumbs/images/science1_4_AtmosphereWaterVapour.jpg)
Atmospheric water vapour
![Average seawater temperature](https://img.sciencehelpdesk.com/thumbs/images/science1_4_SeaWaterTemperature.gif)
Average seawater temperature
![Diagram of the surface oceanic currents, with their roles](https://img.sciencehelpdesk.com/thumbs/images/science1_4_OceanCurrents2.gif)
Diagram of the surface oceanic currents, with their roles
![Diagram of the surface oceanic currents, with their names](https://img.sciencehelpdesk.com/thumbs/images/science1_4_OceanCurrents1.jpg)
Diagram of the surface oceanic currents, with their names
![Oceanic heat conveyor belt](https://img.sciencehelpdesk.com/thumbs/images/science1_4_GlobalOceanConveyor2.gif)
Oceanic heat conveyor belt
![Moon's pull upon the tides](https://img.sciencehelpdesk.com/thumbs/images/science1_4_Tides1.gif)
Moon's pull upon the tides
![Spring tides and neap tides](https://img.sciencehelpdesk.com/thumbs/images/science1_4_Tides2.gif)
Spring tides and neap tides
![The interior of the terrrestrial planets](https://img.sciencehelpdesk.com/thumbs/images/science1_5_TerrestialPlanetsInterior.jpg)
The interior of the terrrestrial planets
![Earth's cutaway](https://img.sciencehelpdesk.com/thumbs/images/science1_5_EarthCutaway2.gif)
Earth's cutaway
![The structure of a continental margin](https://img.sciencehelpdesk.com/thumbs/images/science1_5_ContinentalMargin.gif)
The structure of a continental margin
![Pyrite structure](https://img.sciencehelpdesk.com/thumbs/images/science1_5_PyriteStructure.gif)
Pyrite structure
![Diamond structure](https://img.sciencehelpdesk.com/thumbs/images/science1_5_DiamondStructure.gif)
Diamond structure
![Pyrite growth habit](https://img.sciencehelpdesk.com/thumbs/images/science1_5_PyriteHabit.gif)
Pyrite growth habit
![Main crystal growth habits](https://img.sciencehelpdesk.com/thumbs/images/science1_5_CrystalHabits.gif)
Main crystal growth habits
![Amber with insect](https://img.sciencehelpdesk.com/thumbs/images/science1_5_AmberWithInsect.jpg)
Amber with insect
![Obsidiane](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Obsidiane.jpg)
Obsidiane
![Native gold](https://img.sciencehelpdesk.com/thumbs/images/science1_5_NativeGold.jpg)
Native gold
![Native silver](https://img.sciencehelpdesk.com/thumbs/images/science1_5_NativeSilver.jpg)
Native silver
![Native copper](https://img.sciencehelpdesk.com/thumbs/images/science1_5_NativeCopper.jpg)
Native copper
![Rough diamond](https://img.sciencehelpdesk.com/thumbs/images/science1_5_RoughDiamond.jpg)
Rough diamond
![Graphite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Graphite.jpg)
Graphite
![Sulphur](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Sulfur.jpg)
Sulphur
![Cubic pyrite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_PyriteCubic.jpg)
Cubic pyrite
![Pyrite dodecahedral aggregate](https://img.sciencehelpdesk.com/thumbs/images/science1_5_PyriteDodecahedralAggregate.jpg)
Pyrite dodecahedral aggregate
![Chalcopyrite and prismatic quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_ChalcopyriteAndPrismaticQuartz.jpg)
Chalcopyrite and prismatic quartz
![Cinnabar](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Cinnabar.jpg)
Cinnabar
![Sphalerite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Sphalerite.jpg)
Sphalerite
![Galena](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Galena.jpg)
Galena
![Magnetite octahedral aggregate](https://img.sciencehelpdesk.com/thumbs/images/science1_5_MagnetiteOctahedralAggregate.jpg)
Magnetite octahedral aggregate
![Hematite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Hematite.jpg)
Hematite
![Limonite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Limonite.jpg)
Limonite
![Corundum (rough ruby)](https://img.sciencehelpdesk.com/thumbs/images/science1_5_CorundumRoughRuby.jpg)
Corundum (rough ruby)
![Halite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Halite.jpg)
Halite
![Fluorite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Fluorite.jpg)
Fluorite
![Calcite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Calcite.jpg)
Calcite
![Aragonite acicular aggregate](https://img.sciencehelpdesk.com/thumbs/images/science1_5_AragoniteAcicularAggregate.jpg)
Aragonite acicular aggregate
![Aragonite twinning](https://img.sciencehelpdesk.com/thumbs/images/science1_5_AragoniteTwinning.jpg)
Aragonite twinning
![Azurite and acicular malachite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_AzuriteAndAcicularMalachite.jpg)
Azurite and acicular malachite
![Malachite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Malachite.jpg)
Malachite
![Fibrous gypsum](https://img.sciencehelpdesk.com/thumbs/images/science1_5_GypsumFibrous.jpg)
Fibrous gypsum
![Desert rose gypsum](https://img.sciencehelpdesk.com/thumbs/images/science1_5_GypsumDesertRose.jpg)
Desert rose gypsum
![Rock crystal quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_RockCrystal.jpg)
Rock crystal quartz
![Smoky quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_SmokyQuartz.jpg)
Smoky quartz
![Milk quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_MilkQuartz.jpg)
Milk quartz
![Citrine quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_CitrineQuartz.jpg)
Citrine quartz
![Rose quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_RoseQuartz.jpg)
Rose quartz
![Amethyst quartz](https://img.sciencehelpdesk.com/thumbs/images/science1_5_AmethystQuartz.jpg)
Amethyst quartz
![Orthoclase](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Orthoclase.jpg)
Orthoclase
![Biotite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Biotite.jpg)
Biotite
![Muscovite aggregate](https://img.sciencehelpdesk.com/thumbs/images/science1_5_MuscoviteAggregate.jpg)
Muscovite aggregate
![Olivine](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Olivine.jpg)
Olivine
![Beryl](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Beryl.jpg)
Beryl
![Garnet](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Garnet.jpg)
Garnet
![Talc](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Talc.jpg)
Talc
![Staurolite cross twinning](https://img.sciencehelpdesk.com/thumbs/images/science1_5_StauroliteCrossTwinning.jpg)
Staurolite cross twinning
![The rocks cycle](https://img.sciencehelpdesk.com/thumbs/images/science1_5_RockCycle.gif)
The rocks cycle
![Conglomerate](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Conglomerate1.jpg)
Conglomerate
![Sandstone](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Sandstone03.jpg)
Sandstone
![Mudstone](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Mudstone1.jpg)
Mudstone
![Fossiliferous limestone](https://img.sciencehelpdesk.com/thumbs/images/science1_5_LimestoneFossiliferous5.jpg)
Fossiliferous limestone
![Diorite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Diorite2.jpg)
Diorite
![Grey granite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Granite2Gray.jpg)
Grey granite
![Basalt](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Basalt1.jpg)
Basalt
![Slate](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Slate5.jpg)
Slate
![Micaceous schist](https://img.sciencehelpdesk.com/thumbs/images/science1_5_SchistMicaceous2.jpg)
Micaceous schist
![Banded gneiss](https://img.sciencehelpdesk.com/thumbs/images/science1_5_GneissBanded1.jpg)
Banded gneiss
![Marble](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Marble1.jpg)
Marble
![Quartzite](https://img.sciencehelpdesk.com/thumbs/images/science1_5_Quartzite1.jpg)
Quartzite
![Bacterian morphologies and arrangements](https://img.sciencehelpdesk.com/thumbs/images/science1_7_BacterianMorphologiesAndArrangements.gif)
Bacterian morphologies and arrangements
![Bacterian culture in agar plate](https://img.sciencehelpdesk.com/thumbs/images/science1_7_BacterianCultureInAgarPlate.jpg)
Bacterian culture in agar plate
![Colonies of <i>Streptococcus mutans</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_StreptococcusMutans.jpg)
Colonies of Streptococcus mutans
![<i>Bacillus anthracis</i> with white blood cells](https://img.sciencehelpdesk.com/thumbs/images/science1_7_BacillusAnthracisWithWhiteBloodCells.jpg)
Bacillus anthracis with white blood cells
![<i>Helicobacter pylori</i> showing flagella](https://img.sciencehelpdesk.com/thumbs/images/science1_7_HelicobacterPyloriWithFlagella.jpg)
Helicobacter pylori showing flagella
![<i>Escherichia coli</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_EscherichiaColiPhoto.jpg)
Escherichia coli
![<i>Salmonella typhimurium</i> invading cultured human cells](https://img.sciencehelpdesk.com/thumbs/images/science1_7_SalmonellaTyphimuriumInvadingCulturedHumanCells.jpg)
Salmonella typhimurium invading cultured human cells
![<i>Paramecium sp.</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Paramecium.jpg)
Paramecium sp.
![<i>Stentor roeseli</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_StentorRoeseli.jpg)
Stentor roeseli
![<i>Chaos diffluens</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_ChaosDiffluens.jpg)
Chaos diffluens
![Benthic foraminifera](https://img.sciencehelpdesk.com/thumbs/images/science1_7_BenthicForaminifera.jpg)
Benthic foraminifera
![<i>Trypanosoma</i> between red blood cells](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Trypanosoma.jpg)
Trypanosoma between red blood cells
![<i>Giardia</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Giardia.jpg)
Giardia
![<i>Helvella crispa</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_helvella-crispa-ascomiceto.jpg)
Helvella crispa
![<i>Morchella rotunda</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_morchella-rotunda-ascomiceto.jpg)
Morchella rotunda
![Phytoplankton](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Phytoplankton1.jpg)
Phytoplankton
![Diatoms (microalgae), magnified 5000 times](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Diatom5000x.jpg)
Diatoms (microalgae), magnified 5000 times
![<i>Tabellaria</i>, a diatom](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Tabellaria.jpg)
Tabellaria, a diatom
![Coccosphere stage of an haptophyte alga](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Cocolito.jpg)
Coccosphere stage of an haptophyte alga
![Colony of a a golden alga](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Dinobryon.jpg)
Colony of a a golden alga
![Colonies of green algae](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Volvocales.png)
Colonies of green algae
![Multicellular green algae](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Ulvophyceae.jpg)
Multicellular green algae
![<i>Spirogyra</i>, a filamental green alga](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Spirogyra.jpg)
Spirogyra, a filamental green alga
![<i>Corallina officinalis</i>, a coralline red alga](https://img.sciencehelpdesk.com/thumbs/images/science1_7_CorallinaOfficinalis.jpg)
Corallina officinalis, a coralline red alga
![<i>Macrocystis</i>, a brown alga](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Macrocystis.jpg)
Macrocystis, a brown alga
![<i>Sargassum</i>, a brown alga](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Sargassum.jpg)
Sargassum, a brown alga
![<i>Lobaria pulmonaria</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_LobariaPulmonaria.jpg)
Lobaria pulmonaria
![<i>Parmelia sp.</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Parmelia.jpg)
Parmelia sp.
![<i>Ramalina farinacea</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_RamalinaFarinacea.jpg)
Ramalina farinacea
![<i>Evernia sp.</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Evernia.jpg)
Evernia sp.
![<i>Usnea sp.</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_Usnea.jpg)
Usnea sp.
![<i>Alectoria sarmentosa</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_7_AlectoriaSarmentosa.jpg)
Alectoria sarmentosa
![Global vegetation map](https://img.sciencehelpdesk.com/thumbs/images/science1_8_GlobalVegetationNasa.jpg)
Global vegetation map
![Plant environmental benefits](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PlantEnvironmentalAdvantages.jpg)
Plant environmental benefits
![Flower parts](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FlowerParts.jpg)
Flower parts
![Simple leaf parts](https://img.sciencehelpdesk.com/thumbs/images/science1_8_LeafParts.gif)
Simple leaf parts
![Leaf shapes](https://img.sciencehelpdesk.com/thumbs/images/science1_8_LeafShape.gif)
Leaf shapes
![Leaf margins](https://img.sciencehelpdesk.com/thumbs/images/science1_8_LeafMargins.gif)
Leaf margins
![Leaf venations](https://img.sciencehelpdesk.com/thumbs/images/science1_8_LeafVenations.gif)
Leaf venations
![External stem anatomy](https://img.sciencehelpdesk.com/thumbs/images/science1_8_StemAnatomy3.jpg)
External stem anatomy
![External root anatomy](https://img.sciencehelpdesk.com/thumbs/images/science1_8_RootParts.jpg)
External root anatomy
![<i>Lunularia</i>, a liverwort](https://img.sciencehelpdesk.com/thumbs/images/science1_8_Lunularia.jpg)
Lunularia, a liverwort
![<i>Phaeoceros</i>, a hornwort](https://img.sciencehelpdesk.com/thumbs/images/science1_8_Phaeoceros.jpg)
Phaeoceros, a hornwort
![<i>Anthoceros</i>, a hornwort](https://img.sciencehelpdesk.com/thumbs/images/science1_8_Anthoceros.jpg)
Anthoceros, a hornwort
![<i>Tortula</i>, a moss](https://img.sciencehelpdesk.com/thumbs/images/science1_8_Tortula.jpg)
Tortula, a moss
![<i>Equisetum</i>, a horsetail](https://img.sciencehelpdesk.com/thumbs/images/science1_8_Equisetum.jpg)
Equisetum, a horsetail
![Spore forming strobilus of <i>Equisetum</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_8_EquisetumEstrobilos.jpg)
Spore forming strobilus of Equisetum
![Unrolling fern frond](https://img.sciencehelpdesk.com/thumbs/images/science1_8_HelechoFronde.jpg)
Unrolling fern frond
![Underside of a fern frond](https://img.sciencehelpdesk.com/thumbs/images/science1_8_HelechoSoros.jpg)
Underside of a fern frond
![Maritime pine (<i>Pinus pinaster</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPinaster1.jpg)
Maritime pine (Pinus pinaster)
![Stone pine (<i>Pinus pinea</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPinea2.jpg)
Stone pine (Pinus pinea)
![Stone pine (<i>Pinus pinea</i>) - Bark](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPinea3.jpg)
Stone pine (Pinus pinea) - Bark
![Stone pine (<i>Pinus pinea</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPinea4.jpg)
Stone pine (Pinus pinea) - Leaves
![Stone pine (<i>Pinus pinea</i>) - Expanding shoot in spring](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPineaExpandingShootSpring.jpg)
Stone pine (Pinus pinea) - Expanding shoot in spring
![Stone pine (<i>Pinus pinea</i>) - Closed female cone](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPineaClosedSeedCone.jpg)
Stone pine (Pinus pinea) - Closed female cone
![Stone pine (<i>Pinus pinea</i>) - Open female cone](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPineaOpenSeedCone.jpg)
Stone pine (Pinus pinea) - Open female cone
![Pinecone opening](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PineConeOpening.gif)
Pinecone opening
![Stone pine (<i>Pinus pinea</i>) - Scale from female cone](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPineaBasalScaleFromSeedCone.jpg)
Stone pine (Pinus pinea) - Scale from female cone
![Stone pine (<i>Pinus pinea</i>) - Male cones](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PinusPineaMaleCones.jpg)
Stone pine (Pinus pinea) - Male cones
![Norway spruce (<i>Picea abies</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PiceaAbies4.jpg)
Norway spruce (Picea abies)
![Norway spruce (<i>Picea abies</i>) - Shoot](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PiceaAbies5.jpg)
Norway spruce (Picea abies) - Shoot
![Norway spruce (<i>Picea abies</i>) - Open female cone](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PiceaAbies3.jpg)
Norway spruce (Picea abies) - Open female cone
![Lebanon cedar (<i>Cedrus libani</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CedrusLibani1.jpg)
Lebanon cedar (Cedrus libani)
![Atlas cedar (<i>Cedrus atlantica</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CedrusAtlantica1.jpg)
Atlas cedar (Cedrus atlantica)
![Atlas cedar (<i>Cedrus atlantica</i>) - Foliage and female cone](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CedrusAtlantica3.jpg)
Atlas cedar (Cedrus atlantica) - Foliage and female cone
![Atlas cedar (<i>Cedrus atlantica</i>) - Foliage and male cones](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CedrusAtlantica4.jpg)
Atlas cedar (Cedrus atlantica) - Foliage and male cones
![European yew (<i>Taxus baccata</i>): cone and leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_TaxusBaccata.jpg)
European yew (Taxus baccata): cone and leaves
![Mediterranean cypress (<i>Cupressus sempervirens</i>): scale-like leaves and cones](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CupressusSempervirens.jpg)
Mediterranean cypress (Cupressus sempervirens): scale-like leaves and cones
![Common juniper (<i>Juniperus communis</i>): needle-like leaves and cones](https://img.sciencehelpdesk.com/thumbs/images/science1_8_JuniperusCommunis.jpg)
Common juniper (Juniperus communis): needle-like leaves and cones
![<i>Sequoiadendron</i>: the General Grant tree](https://img.sciencehelpdesk.com/thumbs/images/science1_8_Sequoiadendron.jpg)
Sequoiadendron: the General Grant tree
![<i>Gingko biloba</i> (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_GinkgoBiloba1.jpg)
Gingko biloba (I)
![<i>Gingko biloba</i> (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_GinkgoBiloba2.jpg)
Gingko biloba (II)
![Beech (<i>Fagus sylvatica</i>) - Forest](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FagusSylvatica1.jpg)
Beech (Fagus sylvatica) - Forest
![Beech (<i>Fagus sylvatica</i>) - Foliage](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FagusSylvatica2.jpg)
Beech (Fagus sylvatica) - Foliage
![Beech (<i>Fagus sylvatica</i>) - Leaves and beechnuts](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FagusSylvatica3.jpg)
Beech (Fagus sylvatica) - Leaves and beechnuts
![Pedunculate oak (<i>Quercus robur</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_QuercusRobur1.jpg)
Pedunculate oak (Quercus robur)
![Pyrenean oak (<i>Quercus pyrenaica</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_QuercusPyrenaica3.jpg)
Pyrenean oak (Quercus pyrenaica)
![Holm oak (<i>Quercus ilex</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_QuercusIlex3.jpg)
Holm oak (Quercus ilex)
![Cork oak (<i>Quercus suber</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_QuercusSuber2.jpg)
Cork oak (Quercus suber) - Leaves
![Cork oak (<i>Quercus suber</i>) - Acorns](https://img.sciencehelpdesk.com/thumbs/images/science1_8_QuercusSuber1.jpg)
Cork oak (Quercus suber) - Acorns
![Cork oak (<i>Quercus suber</i>) - Harvested bark](https://img.sciencehelpdesk.com/thumbs/images/science1_8_QuercusSuber4.jpg)
Cork oak (Quercus suber) - Harvested bark
![Black poplar (<i>Populus nigra</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusNigra1.jpg)
Black poplar (Populus nigra)
![Black poplar (<i>Populus nigra</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusNigra2.jpg)
Black poplar (Populus nigra) - Leaves
![Black poplar (<i>Populus nigra</i>) - Burrs on bark](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusNigra3.jpg)
Black poplar (Populus nigra) - Burrs on bark
![White poplar (<i>Populus alba</i>) - Leaves and catkins](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusAlba1.jpg)
White poplar (Populus alba) - Leaves and catkins
![White poplar (<i>Populus alba</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusAlba2.jpg)
White poplar (Populus alba) - Leaves
![Common aspen (<i>Populus tremula</i>) - Leaves (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusTremula1.jpg)
Common aspen (Populus tremula) - Leaves (I)
![Common aspen (<i>Populus tremula</i>) - Leaves (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PopulusTremula2.jpg)
Common aspen (Populus tremula) - Leaves (II)
![Weeping willow (<i>Salix sepulcralis</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_SalixSepulcralis1.jpg)
Weeping willow (Salix sepulcralis)
![Weeping willow (<i>Salix sepulcralis</i>) - Leaves and catkins](https://img.sciencehelpdesk.com/thumbs/images/science1_8_SalixSepulcralis2.jpg)
Weeping willow (Salix sepulcralis) - Leaves and catkins
![White willow (<i>Salix alba</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_SalixAlba1.jpg)
White willow (Salix alba)
![White willow (<i>Salix alba</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_SalixAlba2.jpg)
White willow (Salix alba) - Leaves
![White willow (<i>Salix alba</i>) - Catkin](https://img.sciencehelpdesk.com/thumbs/images/science1_8_SalixAlba3.jpg)
White willow (Salix alba) - Catkin
![Narrow-leafed ash (<i>Fraxinus angustifolia</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FraxinusAngustifolia1.jpg)
Narrow-leafed ash (Fraxinus angustifolia) - Leaves
![European ash (<i>Fraxinus excelsior</i>) - Leave](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FraxinusExcelsior2.jpg)
European ash (Fraxinus excelsior) - Leave
![European ash (<i>Fraxinus excelsior</i>) - Seeds](https://img.sciencehelpdesk.com/thumbs/images/science1_8_FraxinusExcelsior3.jpg)
European ash (Fraxinus excelsior) - Seeds
![Silver Birch (<i>Betula pendula</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_BetulaPendula1.jpg)
Silver Birch (Betula pendula)
![Silver Birch (<i>Betula pendula</i>) - Leaves](https://img.sciencehelpdesk.com/thumbs/images/science1_8_BetulaPendula2.jpg)
Silver Birch (Betula pendula) - Leaves
![Silver Birch (<i>Betula pendula</i>) - Leaves and catkin](https://img.sciencehelpdesk.com/thumbs/images/science1_8_BetulaPendula3.jpg)
Silver Birch (Betula pendula) - Leaves and catkin
![Silver Birch (<i>Betula pendula</i>) - Bark](https://img.sciencehelpdesk.com/thumbs/images/science1_8_BetulaPendula6.jpg)
Silver Birch (Betula pendula) - Bark
![Wych elm (<i>Ulmus glabra</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_UlmusGlabra.jpg)
Wych elm (Ulmus glabra)
![European white elm (<i>Ulmus laevis</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_UlmusLaevis.jpg)
European white elm (Ulmus laevis)
![Box elder maple (<i>Acer negundo</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_AcerNegundo1.jpg)
Box elder maple (Acer negundo)
![Norway maple (<i>Acer platanoides</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_AcerPlatanoides.jpg)
Norway maple (Acer platanoides)
![Field maple (<i>Acer campestre</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_AcerCampestre.jpg)
Field maple (Acer campestre)
![London plane (<i>Platanus x hispanica</i>) (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PlatanusHispanica1.jpg)
London plane (Platanus x hispanica) (I)
![London plane (<i>Platanus x hispanica</i>) (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_PlatanusHispanica3.jpg)
London plane (Platanus x hispanica) (II)
![Common privet (<i>Ligustrum vulgare</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_LigustrumVulgare2.jpg)
Common privet (Ligustrum vulgare)
![White mulberry (<i>Morus alba</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_MorusAlba1.jpg)
White mulberry (Morus alba)
![Black mulberry (<i>Morus nigra</i>)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_MorusNigra1.jpg)
Black mulberry (Morus nigra)
![Mimosa (<i>Acacia dealbata</i>) (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_AcaciaDealbata2.jpg)
Mimosa (Acacia dealbata) (I)
![Mimosa (<i>Acacia dealbata</i>) (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_AcaciaDealbata3.jpg)
Mimosa (Acacia dealbata) (II)
![Common dogwood (<i>Cornus sanguinea</i>) (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CornusSanguinea1.jpg)
Common dogwood (Cornus sanguinea) (I)
![Common dogwood (<i>Cornus sanguinea</i>) (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_8_CornusSanguinea2.jpg)
Common dogwood (Cornus sanguinea) (II)
![Cnidarians: jellyfish and polyps](https://img.sciencehelpdesk.com/thumbs/images/science1_9_MedusaPolyp.png)
Cnidarians: jellyfish and polyps
![Anatomy of a jellyfish](https://img.sciencehelpdesk.com/thumbs/images/science1_9_JellyAnatomy.jpg)
Anatomy of a jellyfish
![Cross section of a jellyfish](https://img.sciencehelpdesk.com/thumbs/images/science1_9_CrossSectionJellyfish.gif)
Cross section of a jellyfish
![Jellyfish cycle (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_JellyfishCycle1.jpg)
Jellyfish cycle (I)
![Jellyfish cycle (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_JellyfishCycle2.jpg)
Jellyfish cycle (II)
![Purple-striped jellyfish](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Purple-StripedJellyfish.jpg)
Purple-striped jellyfish
![Sea netle jellyfish](https://img.sciencehelpdesk.com/thumbs/images/science1_9_SeaNetleJellyfish.jpg)
Sea netle jellyfish
![Polyp tree colony](https://img.sciencehelpdesk.com/thumbs/images/science1_9_PolypTreeColony.gif)
Polyp tree colony
![Fossil polyp colony](https://img.sciencehelpdesk.com/thumbs/images/science1_9_FossilPolypColony.jpg)
Fossil polyp colony
![Soft coral](https://img.sciencehelpdesk.com/thumbs/images/science1_9_SoftCoral.jpg)
Soft coral
![<i>Hydra</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Hydra.jpg)
Hydra
![Taenia saginata](https://img.sciencehelpdesk.com/thumbs/images/science1_9_TaeniaSaginata.jpg)
Taenia saginata
![Scolex of Taenia solium](https://img.sciencehelpdesk.com/thumbs/images/science1_9_TaeniaSoliumScolex.jpg)
Scolex of Taenia solium
![<i>Nautilus pompilius</i>, a cephalopod](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Nautilus1.jpg)
Nautilus pompilius, a cephalopod
![Cross-section of a Nautilus' shell](https://img.sciencehelpdesk.com/thumbs/images/science1_9_NautilusShellCuttaway.jpg)
Cross-section of a Nautilus' shell
![Yellow-jacket wasp queen](https://img.sciencehelpdesk.com/thumbs/images/science1_9_YellowJacketWaspQueen.jpg)
Yellow-jacket wasp queen
![<i>Manthis</i>](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Manthis.jpg)
Manthis
![Wing scales of the sunset moth](https://img.sciencehelpdesk.com/thumbs/images/science1_9_WingScalesOfSunsetMoth.jpg)
Wing scales of the sunset moth
![Common housefly](https://img.sciencehelpdesk.com/thumbs/images/science1_9_common-housefly.jpg)
Common housefly
![Ant walking](https://img.sciencehelpdesk.com/thumbs/images/science1_9_AntWalking.gif)
Ant walking
![<i>Ascidia</i>, a tunicate](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Ascidia1.jpg)
Ascidia, a tunicate
![<i>Branchiotoma lanceolatum</i>, a cephalochordate](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Anfioxo1.jpg)
Branchiotoma lanceolatum, a cephalochordate
![European river lamprey](https://img.sciencehelpdesk.com/thumbs/images/science1_9_LampetraFluviatilis.jpg)
European river lamprey
![Sea lamprey](https://img.sciencehelpdesk.com/thumbs/images/science1_9_PetromyzonMarinus.jpg)
Sea lamprey
![Mouth of a sea lamprey](https://img.sciencehelpdesk.com/thumbs/images/science1_9_LampreaBoca.jpg)
Mouth of a sea lamprey
![Lampreys attached to a trout](https://img.sciencehelpdesk.com/thumbs/images/science1_9_LampreaTrucha.jpg)
Lampreys attached to a trout
![Common toads in amplexus](https://img.sciencehelpdesk.com/thumbs/images/science1_9_BufoBufoAmplexusAxilar.jpg)
Common toads in amplexus
![Parts of a bird](https://img.sciencehelpdesk.com/thumbs/images/science1_9_BirdParts.jpg)
Parts of a bird
![Barn swallow (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_BarnSwallow1.jpg)
Barn swallow (I)
![Barn swallow (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_BarnSwallow2.jpg)
Barn swallow (II)
![Barn swallow (III)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_BarnSwallow4.jpg)
Barn swallow (III)
![House martin (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_HouseMartin1.jpg)
House martin (I)
![House martin (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_HouseMartin2.jpg)
House martin (II)
![Common swift (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_CommonSwift2.jpg)
Common swift (I)
![Common swift (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_CommonSwift3.jpg)
Common swift (II)
![Platypus (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Platypus1.jpg)
Platypus (I)
![Platypus (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Platypus2.jpg)
Platypus (II)
![Echidna (I)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Echidna1.jpg)
Echidna (I)
![Echidna (II)](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Echidna2.jpg)
Echidna (II)
![Kangaroo](https://img.sciencehelpdesk.com/thumbs/images/science1_9_kangaroo.jpg)
Kangaroo
![Virginia opossum](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Zarigueya1.jpg)
Virginia opossum
![Panda bears](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Panda.jpg)
Panda bears
![Fallow deers](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Gamos.jpg)
Fallow deers
![Puma](https://img.sciencehelpdesk.com/thumbs/images/science1_9_Puma.jpg)
Puma
![Glucose, a monosaccharide](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Glucose.gif)
Glucose, a monosaccharide
![Cellulose, a polysaccharide](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Cellulose.gif)
Cellulose, a polysaccharide
![Alanine, an aminoacid](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Alanine.gif)
Alanine, an aminoacid
![Hemoglobin, a protein](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Hemoglobin.gif)
Hemoglobin, a protein
![RuBisCO, a protein](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Rubisco.gif)
RuBisCO, a protein
![Protein structural levels](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_ProteinStructureLevels.png)
Protein structural levels
![Arachidic acid, a fatty acid.](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_AcidoAraquidico.png)
Arachidic acid, a fatty acid.
![DNA structure (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_DnaStructure.jpg)
DNA structure (I)
![DNA structure (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_DnaStructure2.jpg)
DNA structure (II)
![DNA structure (III)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_DnaStructure3.gif)
DNA structure (III)
![DNA structure (IV)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_DnaStructure4.png)
DNA structure (IV)
![Robert Hooke's drawing of a cork](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellRobertHookeDrawingOfCork.jpg)
Robert Hooke's drawing of a cork
![Root hair cell](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_RootHair1.jpg)
Root hair cell
![Human liver cells](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_LiverCell1.jpg)
Human liver cells
![Structure of a prokaryiotic cell](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellProkaryiotic2.gif)
Structure of a prokaryiotic cell
![Structure of an eucaryotic animal cell (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellEukaryioticAnimal1.gif)
Structure of an eucaryotic animal cell (I)
![Structure of an eucaryotic animal cell (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellEukaryioticAnimal2.png)
Structure of an eucaryotic animal cell (II)
![Structure of an eucaryotic plant cell](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellEukaryioticPlant2.gif)
Structure of an eucaryotic plant cell
![Animal cell (blank) (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellAnimalBlank1.jpg)
Animal cell (blank) (I)
![Anlam cell (blank) (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellAnimalBlank2.jpg)
Anlam cell (blank) (II)
![Neurone (blank)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_NeuronaBlank.png)
Neurone (blank)
![Plant cell (blank)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellPlantBlank1.jpg)
Plant cell (blank)
![Structure of the cell membrane](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CellMembrane.jpg)
Structure of the cell membrane
![Structure of a mitochondrion (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_OrganellesMitochondrion1.gif)
Structure of a mitochondrion (I)
![Structure of a mitochondrion (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_OrganellesMitochondrion2.png)
Structure of a mitochondrion (II)
![Mitochondria under the electron microscope](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_mitocondria2.jpg)
Mitochondria under the electron microscope
![Structure of a chloroplast](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_OrganellesChloroplast1.jpg)
Structure of a chloroplast
![Chloroplasts (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_cloroplastos1.jpg)
Chloroplasts (I)
![Chloroplasts (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_cloroplastos2.jpg)
Chloroplasts (II)
![Structure of the Golgi apparatus](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Golgi1.gif)
Structure of the Golgi apparatus
![Golgi apparatus under the electron microscope](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_Golgi2.jpg)
Golgi apparatus under the electron microscope
![Vesicle transport system (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_OrganellesNucleusERGolgiCM1.jpg)
Vesicle transport system (I)
![Vesicle transport system (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_OrganellesNucleusERGolgiCM2.gif)
Vesicle transport system (II)
![The nucleus and the rER](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_OrganellesNucleusER.gif)
The nucleus and the rER
![DNA packaging in a cell](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_NucleusDNAPackaging.jpg)
DNA packaging in a cell
![Human chromosomes in metaphase](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_NucleusChromosomesMetaphase.jpg)
Human chromosomes in metaphase
![Tissues of a plant's leaf](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_LeafTissues.gif)
Tissues of a plant's leaf
![Main human tissues](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_HumanTissues.gif)
Main human tissues
![Human connective tissues](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_ConnectiveTissues.gif)
Human connective tissues
![Epithelial tissues in hominids](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_EpithelialTissues.gif)
Epithelial tissues in hominids
![Compact bone](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_CompactBone.jpg)
Compact bone
![Levels of organisation in the humang being](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_LevelsOfOrganization1.gif)
Levels of organisation in the humang being
![Human body regions](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_BodyPlanes2.gif)
Human body regions
![Human body planes](https://img.sciencehelpdesk.com/thumbs/images/bg3_1_BodyPlanes1.gif)
Human body planes
![Digestive system organs (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_DigestiveSystem1.gif)
Digestive system organs (I)
![Digestive system organs (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_DigestiveSystem2.gif)
Digestive system organs (II)
![Gastric epithelium](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_GastricEpithelium.jpg)
Gastric epithelium
![Duodenum wall](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_DuodenumWall.jpg)
Duodenum wall
![Intestinal villi](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_IntestinalVilli.jpg)
Intestinal villi
![Vermiform appendix of the large intestine](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Appendix.jpg)
Vermiform appendix of the large intestine
![Human breathing movements](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_HumanBreathing.gif)
Human breathing movements
![The ribcage](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Ribcage.gif)
The ribcage
![Human respiratory system (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_RespiratorySystem1.jpg)
Human respiratory system (I)
![Human respiratory system (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_RespiratorySystem2.gif)
Human respiratory system (II)
![Human lungs in detail](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_HumanLungs.gif)
Human lungs in detail
![Bronchiolar epithelium (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_BronchiolarEpithelium1.jpg)
Bronchiolar epithelium (I)
![Bronchiolar epithelium (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_BronchiolarEpithelium2.jpg)
Bronchiolar epithelium (II)
![Alveoli and capillaries](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Alveoli.gif)
Alveoli and capillaries
![Gas exchange through alveoli](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_GasExchangeThroughAlveoli.gif)
Gas exchange through alveoli
![Red blood cells (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_RedBloodCells1.jpg)
Red blood cells (I)
![Red blood cells (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_RedBloodCells2.jpg)
Red blood cells (II)
![Red blood cells (III) Sickle-cell anaemia](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Sickle-CellAnaemia.jpg)
Red blood cells (III) Sickle-cell anaemia
![Squeezed red blood cells in ruptured capillary](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_squeezed-red-blood-cell-in-ruptured-capillary.jpg)
Squeezed red blood cells in ruptured capillary
![Platelets](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Platelets1.jpg)
Platelets
![Air-hardened albumin crystals from blood clot](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_air-hardened-albumin-crystals-from-blood-clot.jpg)
Air-hardened albumin crystals from blood clot
![Chambers of the heart](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_HeartChambers.gif)
Chambers of the heart
![Chambers, valves, arteries and veins of the heart (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_HeartParts3.gif)
Chambers, valves, arteries and veins of the heart (I)
![Chambers, valves, arteries and veins of the heart (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_HeartParts4.gif)
Chambers, valves, arteries and veins of the heart (II)
![Blood vessels](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_BloodVessels.gif)
Blood vessels
![Blood pulmonary and systemic circuits](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_CirculatorySystem1.gif)
Blood pulmonary and systemic circuits
![Arteries of the human body](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Arteries.gif)
Arteries of the human body
![Veins of the human body](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Veins.gif)
Veins of the human body
![Arteries and veins of the human body](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_VeinsArteries1.gif)
Arteries and veins of the human body
![The kidneys from behind](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_KidneysBehind.jpg)
The kidneys from behind
![The urinary system](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_ExcretorySystem4.gif)
The urinary system
![Anatomy of a kidney](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Kidney2.gif)
Anatomy of a kidney
![Anatomy and location of a nephron](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Nephron1.gif)
Anatomy and location of a nephron
![Structure of the renal corpuscle of a nephron](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_RenalCorpuscleBlank.gif)
Structure of the renal corpuscle of a nephron
![The function of the nephron](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_NephronFunction.gif)
The function of the nephron
![How soft drinks affect your health](https://img.sciencehelpdesk.com/thumbs/images/bg3_2_Soda.png)
How soft drinks affect your health
![Neurone](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Neuron6.jpg)
Neurone
![Neurones with glial cell (astrocyte) under the electron microscope](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NeuronsAstrocyte.jpg)
Neurones with glial cell (astrocyte) under the electron microscope
![Drawing by Ramón y Cajal of neurones (1899)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Neurons2.jpg)
Drawing by Ramón y Cajal of neurones (1899)
![Different types of neurones](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Neurons4.gif)
Different types of neurones
![Motor neurone](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NeuronMotor1.jpg)
Motor neurone
![Sensory neurone](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NeuronSensory1.jpg)
Sensory neurone
![Bundles of axons](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Axons.jpg)
Bundles of axons
![Neurone and synapse](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Synapse6.gif)
Neurone and synapse
![Structure of a synapse](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Synapse5.gif)
Structure of a synapse
![The synapse under the electron microscope](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Synapse4.jpg)
The synapse under the electron microscope
![Structure of a nerve](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Nerve1.gif)
Structure of a nerve
![Myelin sheath of a neurone](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NerveMyelinSheath.jpg)
Myelin sheath of a neurone
![Structure of the Nervous System (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NS3.jpg)
Structure of the Nervous System (I)
![Structure of the Nervous System (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NS1.gif)
Structure of the Nervous System (II)
![Concepts map on the Central Nervous System](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_CNSConceptMap.gif)
Concepts map on the Central Nervous System
![Whole brain](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Brain1.jpg)
Whole brain
![Brain cross sections](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_BrainCrossSections.gif)
Brain cross sections
![Sagittal section of the brain](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_BrainSagittalSection3.jpg)
Sagittal section of the brain
![Parts of the brain in sagittal section (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_BrainSagittalSection1.gif)
Parts of the brain in sagittal section (I)
![Parts of the brain in sagittal section (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_BrainSagittalSection2.gif)
Parts of the brain in sagittal section (II)
![Cerebral cortical lobes and functions](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_BrainLobesFunctions1.gif)
Cerebral cortical lobes and functions
![Section of the spinal cord](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_SpinalCord1.gif)
Section of the spinal cord
![Structure and functions of the Autonomic Nervous System](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_ANS2.jpg)
Structure and functions of the Autonomic Nervous System
![Structure of the eye (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Eye04.gif)
Structure of the eye (I)
![Structure of the eye (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Eye10.gif)
Structure of the eye (II)
![Sensory cells of the retina: cones (yellow) and rods (white)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_ConesYellowSticksWhite.jpg)
Sensory cells of the retina: cones (yellow) and rods (white)
![Cross section of the iris](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Iris.jpg)
Cross section of the iris
![Myopia and hyperopia](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_EyeMyopiaHyperopia.jpg)
Myopia and hyperopia
![Structure of the ear (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Ear1.gif)
Structure of the ear (I)
![Structure of the ear (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Ear2.jpg)
Structure of the ear (II)
![Structure of the ear (III)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_Ear3.gif)
Structure of the ear (III)
![Taste buds](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_TasteBuds.jpg)
Taste buds
![Olfactory cells of the nasal cavity's mucosa](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_NasalMucosa.jpg)
Olfactory cells of the nasal cavity's mucosa
![Endocrine organs in humans (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_EndocrineSystem1.gif)
Endocrine organs in humans (I)
![Endocrine organs in humans (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_EndocrineSystem2.gif)
Endocrine organs in humans (II)
![The hypothalamus and the pituitary gland](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_HypothalamusPituitary.gif)
The hypothalamus and the pituitary gland
![Positive feedback in the endocrine system](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_EndocrinePositiveFeedback.jpg)
Positive feedback in the endocrine system
![Negative feedback in the endocrine system](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_EndocrineNegativeFeedback.jpg)
Negative feedback in the endocrine system
![Hormones involved in hunger](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_hunger-hormones.jpg)
Hormones involved in hunger
![Anterior muscles of the human body](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_MusclesAnterior.gif)
Anterior muscles of the human body
![Posterior muscles of the human body](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_MusclesPosterior.gif)
Posterior muscles of the human body
![Muscle attached to bone by a tendon](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_MuscleTendonBone1.gif)
Muscle attached to bone by a tendon
![Tendons and ligaments](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_TendonLigament.gif)
Tendons and ligaments
![The human skeleton (front)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_HumanSkeletonFront.png)
The human skeleton (front)
![The human skeleton (back)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_HumanSkeletonBack.png)
The human skeleton (back)
![The human skull (front)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_HumanSkullFront.png)
The human skull (front)
![The human skull (side)](https://img.sciencehelpdesk.com/thumbs/images/bg3_3_HumanSkullSide.png)
The human skull (side)
![Male reproductive system (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_MaleReproductiveSystem02.gif)
Male reproductive system (I)
![Male reproductive system (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_MaleReproductiveSystem04.gif)
Male reproductive system (II)
![Male reproductive system (III)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_MaleReproductiveSystem11.gif)
Male reproductive system (III)
![Male reproductive system (IV)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_MaleReproductiveSystem05.gif)
Male reproductive system (IV)
![Male reproductive system (V)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_MaleReproductiveSystem06.gif)
Male reproductive system (V)
![Male reproductive system (VI)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_MaleReproductiveSystem08.gif)
Male reproductive system (VI)
![Vasectomy](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Vasectomy.gif)
Vasectomy
![Female reproductive system (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleReproductiveSystem02.gif)
Female reproductive system (I)
![Female reproductive system (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleReproductiveSystem04.gif)
Female reproductive system (II)
![Female reproductive system (III)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleReproductiveSystem05.gif)
Female reproductive system (III)
![Female reproductive system (IV)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleReproductiveSystem06.gif)
Female reproductive system (IV)
![Female reproductive system (V)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleReproductiveSystem08.gif)
Female reproductive system (V)
![Development of the endometrium](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleCycle7.gif)
Development of the endometrium
![Development of a follicle (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleCycle5.gif)
Development of a follicle (I)
![Development of a follicle (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleCycle6.gif)
Development of a follicle (II)
![Development of a follicle and of the endometrium](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleCycle8.gif)
Development of a follicle and of the endometrium
![Hormonal control of the menstrual cycle](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FemaleCycle4.jpg)
Hormonal control of the menstrual cycle
![Estradiol crystals](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Estradiol.jpg)
Estradiol crystals
![Egg and sperms (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EggSperm3.jpg)
Egg and sperms (I)
![Egg and sperms (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EggSperm1.jpg)
Egg and sperms (II)
![Egg and sperms (III)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EggSperm2.jpg)
Egg and sperms (III)
![Sperm (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Sperm1.gif)
Sperm (I)
![Sperm (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Sperm2.gif)
Sperm (II)
![Sperm production in the seminiferous tubules](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_SpermProduction.jpg)
Sperm production in the seminiferous tubules
![Ovulation](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Ovulation1.gif)
Ovulation
![Fertilization](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Fertilization2.gif)
Fertilization
![Ovulation, fertilization and implantation (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EmbryonicDevelopmentEarly2.gif)
Ovulation, fertilization and implantation (I)
![Ovulation, fertilization and implantation (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EmbryonicDevelopmentEarly5.gif)
Ovulation, fertilization and implantation (II)
![Ovulation, fertilization and implantation (III)](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EmbryonicDevelopmentEarly3.gif)
Ovulation, fertilization and implantation (III)
![First stages of the embryonic development](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EmbryonicDevelopmentEarly7.jpg)
First stages of the embryonic development
![Embryonic development up until implantation](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EmbryonicDevelopmentEarly6.gif)
Embryonic development up until implantation
![Embryonic development in the first 60 days](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_EmbryonicDevelopmentComplete1.jpg)
Embryonic development in the first 60 days
![Morula](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Morula.jpg)
Morula
![5 weeks embryo](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Embryo5weeks.gif)
5 weeks embryo
![9 months fetus](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_Embryo9months.gif)
9 months fetus
![Development of the face of a human fetus](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_FetusFace.gif)
Development of the face of a human fetus
![Good news](https://img.sciencehelpdesk.com/thumbs/images/bg3_4_UseCondomsIdiot.png)
Good news
![Pyrite structure](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_PyriteStructure.gif)
Pyrite structure
![Diamond structure](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_DiamondStructure.gif)
Diamond structure
![Graphite structure](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_GraphiteStructure.gif)
Graphite structure
![Pyrite growth habit](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_PyriteHabit.gif)
Pyrite growth habit
![Main crystal growth habits](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_CrystalHabits.gif)
Main crystal growth habits
![Native gold](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_NativeGold.jpg)
Native gold
![Native silver](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_NativeSilver.jpg)
Native silver
![Native copper](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_NativeCopper.jpg)
Native copper
![Rough diamond](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_DiamondRough.jpg)
Rough diamond
![Graphite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Graphite.jpg)
Graphite
![Sulphur](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Sulfur.jpg)
Sulphur
![Cubic pyrite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_PyriteCubic.jpg)
Cubic pyrite
![Pyrite dodecahedral aggregate](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_PyriteDodecahedralAggregate.jpg)
Pyrite dodecahedral aggregate
![Chalcopyrite and prismatic quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_ChalcopyriteAndPrismaticQuartz.jpg)
Chalcopyrite and prismatic quartz
![Cinnabar](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Cinnabar.jpg)
Cinnabar
![Sphalerite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Sphalerite.jpg)
Sphalerite
![Galena](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Galena.jpg)
Galena
![Magnetite octahedral aggregate](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_MagnetiteOctahedralAggregate.jpg)
Magnetite octahedral aggregate
![Hematite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Hematite.jpg)
Hematite
![Limonite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Limonite.jpg)
Limonite
![Corundum (rough ruby)](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_CorundumRoughRuby.jpg)
Corundum (rough ruby)
![Halite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Halite.jpg)
Halite
![Fluorite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Fluorite.jpg)
Fluorite
![Calcite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Calcite.jpg)
Calcite
![Aragonite acicular aggregate](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_AragoniteAcicularAggregate.jpg)
Aragonite acicular aggregate
![Aragonite twinning](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_AragoniteTwinning.jpg)
Aragonite twinning
![Dolomite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Dolomite.jpg)
Dolomite
![Siderite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Siderite.jpg)
Siderite
![Magnesite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Magnesite.jpg)
Magnesite
![Azurite and acicular malachite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_AzuriteAndAcicularMalachite.jpg)
Azurite and acicular malachite
![Malachite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Malachite.jpg)
Malachite
![Barite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Barite.jpg)
Barite
![Celestine](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Celestine.jpg)
Celestine
![Anhydrite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Anhydrite.jpg)
Anhydrite
![Fibrous gypsum](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_GypsumFibrous.jpg)
Fibrous gypsum
![Desert rose gypsum](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_GypsumDesertRose.jpg)
Desert rose gypsum
![Rock crystal quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_RockCrystal.jpg)
Rock crystal quartz
![Smoky quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_SmokyQuartz.jpg)
Smoky quartz
![Milk quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_MilkQuartz.jpg)
Milk quartz
![Citrine quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_CitrineQuartz.jpg)
Citrine quartz
![Rose quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_RoseQuartz.jpg)
Rose quartz
![Amethyst quartz](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_AmethystQuartz.jpg)
Amethyst quartz
![Agate (banded variety of chalcedony)](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Agate.jpg)
Agate (banded variety of chalcedony)
![Orthoclase](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Orthoclase.jpg)
Orthoclase
![Biotite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Biotite.jpg)
Biotite
![Muscovite aggregate](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_MuscoviteAggregate.jpg)
Muscovite aggregate
![Olivine](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Olivine.jpg)
Olivine
![Beryl](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Beryl.jpg)
Beryl
![Tourmaline](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Tourmaline.jpg)
Tourmaline
![Garnet](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Garnet.jpg)
Garnet
![Talc](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Talc.jpg)
Talc
![Chlorite](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Chlorite.jpg)
Chlorite
![Serpentine](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Serpentine.jpg)
Serpentine
![Staurolite cross twinning](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_StauroliteCrossTwinning.jpg)
Staurolite cross twinning
![Amber with insect](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_AmberWithInsect.jpg)
Amber with insect
![Obsidiane](https://img.sciencehelpdesk.com/thumbs/images/bg3_6_Obsidiane.jpg)
Obsidiane
![Conglomerate](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Conglomerate1.jpg)
Conglomerate
![Breccia](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Breccia2.jpg)
Breccia
![Sandstone](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Sandstone03.jpg)
Sandstone
![Siltstone](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Siltstone2.jpg)
Siltstone
![Mudstone](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Mudstone1.jpg)
Mudstone
![Weathered limestone](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_LimestoneWeathered1.jpg)
Weathered limestone
![Chalk](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_LimestoneChalk1.jpg)
Chalk
![Fossiliferous limestone](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_LimestoneFossiliferous5.jpg)
Fossiliferous limestone
![Flysch of Zumaia (I)](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Zumaia-Flysch-1.jpg)
Flysch of Zumaia (I)
![Flysch of Zumaia (II)](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Zumaia-Flysch-2.jpg)
Flysch of Zumaia (II)
![Peat](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_CoalPeat1.jpg)
Peat
![Lignite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_CoalLignite2.jpg)
Lignite
![Bituminous coal](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_CoalBituminous1.jpg)
Bituminous coal
![Anthracite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_CoalAnthracite1.jpg)
Anthracite
![Peridotite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Peridotite2.jpg)
Peridotite
![Gabbro](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Gabbro1.jpg)
Gabbro
![Diorite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Diorite2.jpg)
Diorite
![Gray granite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Granite2Gray.jpg)
Gray granite
![Red granite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Granite2Red.jpg)
Red granite
![Syenite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Syenite3.jpg)
Syenite
![Pegmatite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Pegmatite1.jpg)
Pegmatite
![Porphyry](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Porphyry.jpg)
Porphyry
![Andesite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Andesite1.jpg)
Andesite
![Basalt](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Basalt1.jpg)
Basalt
![Basaltic volcanic bomb](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_VolcanicBomb1.jpg)
Basaltic volcanic bomb
![Pumice](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Pumice4.jpg)
Pumice
![Obsidiane](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Obsidiane.jpg)
Obsidiane
![Ropy lava](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_LavaPahoehoe.jpg)
Ropy lava
![Pillow lava](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_PillowLavas1.jpg)
Pillow lava
![Cataclasite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Cataclasita.jpg)
Cataclasite
![Marble](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Marble1.jpg)
Marble
![Quartzite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Quartzite1.jpg)
Quartzite
![Hornfels](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Corneana2.jpg)
Hornfels
![Slate](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Slate5.jpg)
Slate
![Phyllite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Phyllite1.jpg)
Phyllite
![Micaceous schist](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_SchistMicaceous2.jpg)
Micaceous schist
![Garnetiferous mica schist](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_SchistMicaceousGarnetiferous1.jpg)
Garnetiferous mica schist
![Banded gneiss](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_GneissBanded1.jpg)
Banded gneiss
![Augen gneiss](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_GneissAugen2.jpg)
Augen gneiss
![Migmatite](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_Migmatita.jpg)
Migmatite
![The rock cycle](https://img.sciencehelpdesk.com/thumbs/images/bg3_7_RockCycle.gif)
The rock cycle
![Human male karyotype](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_HumanMaleKaryotype.png)
Human male karyotype
![Human female karyotype](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_HumanFemaleKaryotype.jpg)
Human female karyotype
![Codominance](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_HowGeneticsWorks.jpg)
Codominance
![Independent assortment and segregation of alleles in meiosis](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_IndependentAssortmentSegregation.png)
Independent assortment and segregation of alleles in meiosis
![Double-stranded DNA: the double helix (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_DNA1.jpg)
Double-stranded DNA: the double helix (I)
![Double-stranded DNA: the double helix (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_DNA2.gif)
Double-stranded DNA: the double helix (II)
![DNA<sub>ds</sub> base pairing (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_DNA3.jpg)
DNAds base pairing (I)
![DNA<sub>ds</sub> base pairing (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_DNA4.png)
DNAds base pairing (II)
![Gene, DNA and chromosome](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_Gene.gif)
Gene, DNA and chromosome
![Single chromosome mutations](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_MutationSingleChromosome.gif)
Single chromosome mutations
![Two chromosome mutations](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_MutationTwoChromosome.gif)
Two chromosome mutations
![Genetic manipulation: making recombinant DNA (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_GeneticManipulation3.gif)
Genetic manipulation: making recombinant DNA (I)
![Genetic manipulation: making recombinant DNA (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_GeneticManipulation1.gif)
Genetic manipulation: making recombinant DNA (II)
![Genetic manipulation: making sticky ends](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_GeneticManipulation2.gif)
Genetic manipulation: making sticky ends
![Animal cloning by nuclear transfer (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_NuclearTransfer.gif)
Animal cloning by nuclear transfer (I)
![Animal cloning by nuclear transfer (II): Dolly the sheep](https://img.sciencehelpdesk.com/thumbs/images/bg4_2_NuclearTransferDolly.png)
Animal cloning by nuclear transfer (II): Dolly the sheep
![The voyage of the Beagle](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_VoyageOfTheBeagle.gif)
The voyage of the Beagle
![Darwin's first evolutionary tree](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_DarwinFirstEvolutionaryTree.png)
Darwin's first evolutionary tree
![Recombination by independent segregation of chromosomes in meiosis](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_IndependentSegregationOfParentalChromosomes.gif)
Recombination by independent segregation of chromosomes in meiosis
![Recombination by crossing over in meiosis (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_CrossingoverRecombination1.gif)
Recombination by crossing over in meiosis (I)
![Recombination by crossing over in meiosis (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_CrossingoverRecombination3.gif)
Recombination by crossing over in meiosis (II)
![Evolutionary change in the peppered moth](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_BistonBetularia.jpg)
Evolutionary change in the peppered moth
![Natural selection of peppered moth for dark coloration](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_NaturalSelectionOfDarkColoration.png)
Natural selection of peppered moth for dark coloration
![Natural selection of antibiotic-resistant bacteria](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_NaturalSelectionAntibiotics.gif)
Natural selection of antibiotic-resistant bacteria
![Types of speciation by cladogenesis](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_SpeciationI.png)
Types of speciation by cladogenesis
![Speciation by geographic isolation: Darwin's finches](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_DarwinsFinches.jpeg)
Speciation by geographic isolation: Darwin's finches
![Caricature of Darwin as an ape](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_DarwinCaricatureAsApe.jpg)
Caricature of Darwin as an ape
![Intelligent Design](https://img.sciencehelpdesk.com/thumbs/images/bg4_3_IntelligentGeography.jpg)
Intelligent Design
![Why is the fossil record gappy and uneven?](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_FossilizationRates.png)
Why is the fossil record gappy and uneven?
![Ripple marks](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_RippleMarks.jpg)
Ripple marks
![Artistic depiction of the protoplanetary disk](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_ProtoplanetaryDisk.jpg)
Artistic depiction of the protoplanetary disk
![Artistic depiction of the process of accretion in the protoplanetary disk](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Acrecion.jpg)
Artistic depiction of the process of accretion in the protoplanetary disk
![Artistic depiction of the collision between Theia and the Earth (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_MoonFormation.jpg)
Artistic depiction of the collision between Theia and the Earth (I)
![Artistic depiction of the collision between Theia and the Earth (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_MoonFormation2.jpg)
Artistic depiction of the collision between Theia and the Earth (II)
![Acasta gneiss (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_acasta1.jpg)
Acasta gneiss (I)
![Acasta gneiss (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_acasta2.jpg)
Acasta gneiss (II)
![Earth's ice through geologic time](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_IceThruGeologicTime.jpg)
Earth's ice through geologic time
![Earth's clock](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_GeologicClock.jpg)
Earth's clock
![Fossil stromatolites](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_StromatolitesFossil.jpg)
Fossil stromatolites
![Alive stromatolites in Shark Bay, Australia](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_StromatolitesSharkbay.jpg)
Alive stromatolites in Shark Bay, Australia
![Filamentous cyanobacteria](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_AnabaenaSperica.jpg)
Filamentous cyanobacteria
![Depiction of Ediacaran life forms](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_EdiacaranLifeForms.jpg)
Depiction of Ediacaran life forms
![Anatomy of trilobites](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Trilobite2Anatomy.gif)
Anatomy of trilobites
![Trilobite in lateral and ventral views](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Trilobite3LateralVentral.jpg)
Trilobite in lateral and ventral views
![Enrolled trilobite](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Trilobite1Enrolled.jpg)
Enrolled trilobite
![Cruziana, trackways of trilobites (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Cruziana1.jpg)
Cruziana, trackways of trilobites (I)
![Cruziana, trackways of trilobites (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Cruziana3.jpg)
Cruziana, trackways of trilobites (II)
![Reconstruction of an ammonite](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_AmmoniteReconstruction.jpg)
Reconstruction of an ammonite
![Large ammonite fossil](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Ammonite3.jpg)
Large ammonite fossil
![Iridiscent ammonite fossil](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Ammonite2.jpg)
Iridiscent ammonite fossil
![The truth about dinosaurs](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_TruthAboutDinosaurs.jpg)
The truth about dinosaurs
![Fossil of <i>Archaeopteryx</i> (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Archaeopteryx3.jpg)
Fossil of Archaeopteryx (I)
![Fossil of <i>Archaeopteryx</i> (II) with impressions of feathers](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Archaeopteryx1.jpg)
Fossil of Archaeopteryx (II) with impressions of feathers
![Fossil of <i>Archaeopteryx</i> (III) with impressions of feathers](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Archaeopteryx2.jpg)
Fossil of Archaeopteryx (III) with impressions of feathers
![Replica of an <i>Archaeopteryx</i> skeleton](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Archaeopteryx4.jpg)
Replica of an Archaeopteryx skeleton
![Model of <i>Archaeopteryx</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Archaeopteryx5.jpg)
Model of Archaeopteryx
![The crater of Chicxulub](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Chicxulub.jpg)
The crater of Chicxulub
![Phylogenetic tree of Primates](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_primates1.jpg)
Phylogenetic tree of Primates
![Hominoids' skeletons](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Hominoids.png)
Hominoids' skeletons
![Phylogenetic tree of Hominines (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_hominina0.gif)
Phylogenetic tree of Hominines (I)
![Phylogenetic tree of Hominines (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_hominina1.jpg)
Phylogenetic tree of Hominines (II)
![Phylogenetic tree of Hominines (III)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_hominina2.jpg)
Phylogenetic tree of Hominines (III)
![Pelvic girdle in hominines](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Pelvis.gif)
Pelvic girdle in hominines
![Toumaï (<i>Sahelanthhropus tchadensis</i>)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Toumai.jpg)
Toumaï (Sahelanthhropus tchadensis)
![<i>Ardipithecus ramidus</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_ArdipithecusRamidus.jpg)
Ardipithecus ramidus
![<i>Paranthropus aethiopicus</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_ParanthropusAethiopicus.jpg)
Paranthropus aethiopicus
![<i>Paranthropus boisei</i> (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_ParanthropusBoisei1.jpg)
Paranthropus boisei (I)
![<i>Paranthropus boisei</i> (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_ParanthropusBoisei2.jpg)
Paranthropus boisei (II)
![<i>Kenyanthropus platyops</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_KenyanthropusPlatyops.jpg)
Kenyanthropus platyops
![Lucy (<i>Australopithecus afarensis</i>)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_Lucy.jpg)
Lucy (Australopithecus afarensis)
![Reconstruction of the skull of <i>Australopithecus afarensis</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_AustralopithecusAfarensisReconstruction.jpg)
Reconstruction of the skull of Australopithecus afarensis
![Mrs. Ples (<i>Australopithecus africanus</i>)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_AustralopithecusAfricanusMrsPlesReplica.jpg)
Mrs. Ples (Australopithecus africanus)
![<i>Homo habilis</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_HomoHabilisKNMER1813.jpg)
Homo habilis
![Turkana boy (<i>Homo ergaster</i>)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_TurkanaBoyHomoErgaster.jpg)
Turkana boy (Homo ergaster)
![Incomplete skull of <i>Homo antecessor</i> from Atapuerca (Spain)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_HomoAntecessor.jpg)
Incomplete skull of Homo antecessor from Atapuerca (Spain)
![<i>Homo heidelbergensis</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_HomoHeidelbergensis.jpg)
Homo heidelbergensis
![<i>Homo neanderthalensis</i>](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_HomoNeanderthalensis.jpg)
Homo neanderthalensis
![Archaic <i>Homo sapiens</i> (Cro-Magnon)](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_HomoSapiensCromagnon.jpg)
Archaic Homo sapiens (Cro-Magnon)
![Comparison between <i>H. sapiens</i> and <i>H. neanderthalensis</i> skulls](https://img.sciencehelpdesk.com/thumbs/images/bg4_4_NeanderthalVsSapiens.jpg)
Comparison between H. sapiens and H. neanderthalensis skulls
![Leaf anatomy](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_LeafAnatomy1.gif)
Leaf anatomy
![Leaf anatomy and stoma](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_LeafCrossSection1.jpg)
Leaf anatomy and stoma
![Cross section of a leaf (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_LeafSection1.jpg)
Cross section of a leaf (I)
![Cross section of a leaf (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_LeafSection2.jpg)
Cross section of a leaf (II)
![Cross section of a leaf (III)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_LeafSection3Zea.jpg)
Cross section of a leaf (III)
![Stomata (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Stomata1.jpg)
Stomata (I)
![Stomata (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Stomata2Hibiscus.jpg)
Stomata (II)
![Stomata (III)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Stomata3.jpg)
Stomata (III)
![Stomata (IV)](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Stomata6.jpg)
Stomata (IV)
![Internal root anatomy](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_InternalRootAnatomy.gif)
Internal root anatomy
![Cross section of a root](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Root3Zea.jpg)
Cross section of a root
![Internal stem anatomy](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_XylemPhloem.jpg)
Internal stem anatomy
![Vascular bundles of the stem](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_StemVascularBundles.gif)
Vascular bundles of the stem
![Cross section of a celery stalk](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_CeleryCrossSection.jpg)
Cross section of a celery stalk
![Cross section of a stem](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Stem1.jpg)
Cross section of a stem
![Xylem](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Xylem.jpg)
Xylem
![Phloem](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Phloem.jpg)
Phloem
![Water movement in plants](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_WaterMovement.gif)
Water movement in plants
![Flowering spike of a meadow foxtail](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_MeadowFoxtailFloweringHead.jpg)
Flowering spike of a meadow foxtail
![Pine pollen grain](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_PinePollenGrain.jpg)
Pine pollen grain
![Fruit diagram](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_DrupeFruitDiagram.png)
Fruit diagram
![Types of buds](https://img.sciencehelpdesk.com/thumbs/images/bg4_5_Buds.png)
Types of buds
![Trophic chains](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_TrophicChains.jpg)
Trophic chains
![Trophic web](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_TrophicWeb.gif)
Trophic web
![Carbon cycle (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_CarbonCycle1.gif)
Carbon cycle (I)
![Carbon cycle (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_CarbonCycle2.gif)
Carbon cycle (II)
![Nitrogen cycle (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_NitrogenCycle3.jpg)
Nitrogen cycle (I)
![Nitrogen cycle (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_NitrogenCycle8.jpg)
Nitrogen cycle (II)
![The flow of the Sun's radiation across the Earth (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_SolarRadiationFlow.jpg)
The flow of the Sun's radiation across the Earth (I)
![The flow of the Sun's radiation across the Earth (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ClimateChange2.jpg)
The flow of the Sun's radiation across the Earth (II)
![Variation of temperatures in the last 130 years](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ClimateChange10.jpg)
Variation of temperatures in the last 130 years
![Variation of temperatures and CO<sub>2</sub> concentrations in the last 130 years](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ClimateChange6.gif)
Variation of temperatures and CO2 concentrations in the last 130 years
![Records of monthly temperatures in the last 130 years](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ClimateChange7.jpg)
Records of monthly temperatures in the last 130 years
![Variation of temperatures between 1979 and 2008](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ClimateChange9.jpg)
Variation of temperatures between 1979 and 2008
![Main sources of CO<sub>2</sub> emissions](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ClimateChange8.gif)
Main sources of CO2 emissions
![Annual greenhouse gas emissions by sector](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_GreenhouseGasBySector.png)
Annual greenhouse gas emissions by sector
![Seasonal melting of the Greenland ice sheet](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_SeasonalGreenlandMelting.jpg)
Seasonal melting of the Greenland ice sheet
![Measures to cool down the Earth](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_CoolingDownTheEarth.jpg)
Measures to cool down the Earth
![Worldwide consumption of CFCs and HCFCs](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_CFCconsumption.jpg)
Worldwide consumption of CFCs and HCFCs
![Causes and consequences of acid rain](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_AcidRain3.gif)
Causes and consequences of acid rain
![Acid rain damaged wood](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_AcidRainWoods.jpg)
Acid rain damaged wood
![Acid rain damaged monument](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_AcidRainMonument.jpg)
Acid rain damaged monument
![What kills more than 8,000,000 people every year?](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_8million.jpg)
What kills more than 8,000,000 people every year?
![The most dangerous species in the Mediterranean sea](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_MediterraneanWastes.jpg)
The most dangerous species in the Mediterranean sea
![Accumulation of DDT through the food chains](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_DDTChain1.jpg)
Accumulation of DDT through the food chains
![Land use before and after humans](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_LandUse.jpg)
Land use before and after humans
![Ecoregions status](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_EcoregionsStatus.jpg)
Ecoregions status
![Extinction hotspots](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_ExtinctionHotSpots.gif)
Extinction hotspots
![How would the Earth change if Mankind died off?](https://img.sciencehelpdesk.com/thumbs/images/bg4_6_EarthWithoutUs.jpg)
How would the Earth change if Mankind died off?
![Earth's cutaway](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_EarthCutaway2.gif)
Earth's cutaway
![Convection currents in the Asthenosphere](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_ConvectionCurrents.gif)
Convection currents in the Asthenosphere
![Prominent hotspots (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_CourtHotspots.png)
Prominent hotspots (I)
![Prominent hotspots (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_ProminentHotspots.png)
Prominent hotspots (II)
![Heat flow in the Geosphere](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Heat_flow_of_the_inner_earth.jpg)
Heat flow in the Geosphere
![The structure of a volcano](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_VolcanoStructure.gif)
The structure of a volcano
![Mount Egmont volcano in New Zealand](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_VolcanoMtEgmontNZ.jpg)
Mount Egmont volcano in New Zealand
![Cleveland volcano in the Aleutian Islands](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_VolcanoClevelandAleutianIslands.jpg)
Cleveland volcano in the Aleutian Islands
![Volcanic landscape in Saudi Arabia](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_VolcanicLandscapeSaudiArabia.jpg)
Volcanic landscape in Saudi Arabia
![Hawaii archipelago](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Hawaii.jpg)
Hawaii archipelago
![Mons Olympus volcano in Mars](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_VolcanoOlympusMonsVikingI.jpg)
Mons Olympus volcano in Mars
![The Pacific Ring of Fire](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicsRingOfFire.gif)
The Pacific Ring of Fire
![Map of volcanoes](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_VolcanoesMap.jpg)
Map of volcanoes
![Map of earthquakes](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_EarthqakesMap.jpg)
Map of earthquakes
![Map of earthquakes epicenters in the past decades](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicsEarthquakesMap2.gif)
Map of earthquakes epicenters in the past decades
![Quakes in the Kuril-Kamchatka Trench](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Kuril-Kamchatka_Trench_USGS.png)
Quakes in the Kuril-Kamchatka Trench
![Types of seismic waves](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_SeismicWaves.gif)
Types of seismic waves
![Diagram of the formation of a tsunami](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TsunamiDiagram.jpg)
Diagram of the formation of a tsunami
![Water retreatment in the coast of Sri-Lanka before the tsunami](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TsunamiPhoto.jpg)
Water retreatment in the coast of Sri-Lanka before the tsunami
![The Himalayas](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Himalayas.jpg)
The Himalayas
![The opening of the Atlantic Ocean according to Antonio Snider-Pellegrini in 1858](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Antonio_Snider-Pellegrini_Opening_of_the_Atlantic.jpg)
The opening of the Atlantic Ocean according to Antonio Snider-Pellegrini in 1858
![Pangaea](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Pangea.png)
Pangaea
![Labelled map of the tectonic plates](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicPlates3.png)
Labelled map of the tectonic plates
![Blank map of the tectonic plates](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicPlatesBlank.png)
Blank map of the tectonic plates
![Earth's map showing the oceanic relief](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_EarthMap1.jpg)
Earth's map showing the oceanic relief
![Oceanic relief in the northern Pacific](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Hawaii_hotspot.jpg)
Oceanic relief in the northern Pacific
![The structure of a continental margin](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_ContinentalMargin2.gif)
The structure of a continental margin
![Types of tectonic boundaries](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaries.gif)
Types of tectonic boundaries
![Divergent tectonic boundary in Iceland](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryDivergent-Iceland.gif)
Divergent tectonic boundary in Iceland
![Divergent tectonic boundary in the Persian Gulf](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryDivergent-PersianGulf.jpg)
Divergent tectonic boundary in the Persian Gulf
![Convergent tectonic boundary between two continental plates](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryConvergent-CC.gif)
Convergent tectonic boundary between two continental plates
![Convergent tectonic boundary between two continental plates: the Himalayas](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryConvergent-CC-Himalayas.jpg)
Convergent tectonic boundary between two continental plates: the Himalayas
![Convergent tectonic boundary between an oceanic and a continental plate](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryConvergent-OC1.gif)
Convergent tectonic boundary between an oceanic and a continental plate
![Marianas trench](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Marianatrenchmap.jpg)
Marianas trench
![Bathyscaphe Trieste](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Bathyscaphe_Trieste.jpg)
Bathyscaphe Trieste
![Convergent tectonic boundary between an oceanic plate and a mixed plate](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryConvergent-OO.gif)
Convergent tectonic boundary between an oceanic plate and a mixed plate
![Transform boundary in the San Andreas fault](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_TectonicBoundaryTransform-SanAndreas3.jpg)
Transform boundary in the San Andreas fault
![Peridotite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Peridotite2.jpg)
Peridotite
![Gabbro](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Gabbro1.jpg)
Gabbro
![Diorite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Diorite2.jpg)
Diorite
![Grey granite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Granite2Gray.jpg)
Grey granite
![Red granite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Granite2Red.jpg)
Red granite
![Syenite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Syenite3.jpg)
Syenite
![Pegmatite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Pegmatite1.jpg)
Pegmatite
![Porphyry](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Porphyry.jpg)
Porphyry
![Andesite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Andesite1.jpg)
Andesite
![Basalt](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Basalt1.jpg)
Basalt
![Pumice](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Pumice4.jpg)
Pumice
![Obsidiane](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Obsidiane.jpg)
Obsidiane
![Slate](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Slate5.jpg)
Slate
![Phyllite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Phyllite1.jpg)
Phyllite
![Micaceous schist](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_SchistMicaceous2.jpg)
Micaceous schist
![Micaceous garnetiferous schist](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_SchistMicaceousGarnetiferous1.jpg)
Micaceous garnetiferous schist
![Banded gneiss](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_GneissBanded1.jpg)
Banded gneiss
![Augen gneiss](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_GneissAugen2.jpg)
Augen gneiss
![Marble](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Marble1.jpg)
Marble
![Quartzite](https://img.sciencehelpdesk.com/thumbs/images/bg4_7_Quartzite1.jpg)
Quartzite
![Frost shattering](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_FreezeThaw.jpg)
Frost shattering
![Frost shattering in the Antarctica](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_FreezeThawAntarctica.jpg)
Frost shattering in the Antarctica
![Sand dunes in the Arabian Empty Quarter](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_SandDunesArabianEmptyQuarter.jpg)
Sand dunes in the Arabian Empty Quarter
![Namib desert with dunes up to 300 m tall](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_NamibDesert.jpg)
Namib desert with dunes up to 300 m tall
![The formation of glacial ice from snow](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_GlacialIceFormation.jpg)
The formation of glacial ice from snow
![West fjords in Iceland](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_WestFjordsIceland.jpg)
West fjords in Iceland
![Ice cap in Iceland](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_IceCapIceland.jpg)
Ice cap in Iceland
![Valley glacier in New Zealand](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_ValleyGlacierNZ.jpg)
Valley glacier in New Zealand
![Valley glacier in Switherland with medial moraines](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_ValleyGlacierSwitherland.jpg)
Valley glacier in Switherland with medial moraines
![Ablation zone, medial moraines and crevasses in the Bear Glacier, Alaska](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_BearGlacier.jpg)
Ablation zone, medial moraines and crevasses in the Bear Glacier, Alaska
![Tongue of the Malaspina Glacier in Alaska](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_GlacierMalaspinaTongue.jpg)
Tongue of the Malaspina Glacier in Alaska
![U-shaped glacial valley](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_GlacialValleyU1.jpg)
U-shaped glacial valley
![Cirque glacier (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_CirqueGlacierCanada.jpg)
Cirque glacier (I)
![Cirque glacier (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_CirqueGlacierUSA.jpg)
Cirque glacier (II)
![The formation of a waterfall](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_WaterfallFormation.gif)
The formation of a waterfall
![Gorge and waterfalls](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_GorgeWaterfalls1.jpg)
Gorge and waterfalls
![V-shaped river valley](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_RiverValleyV1.jpg)
V-shaped river valley
![Meanders](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Meanders1.gif)
Meanders
![Meander in the river Duero, Spain](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_meandrodeldueropinilladefermoselle-beatrizmayoral.jpg)
Meander in the river Duero, Spain
![Meander in the river Meuse, France](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_MeandersRiverMeuse.jpg)
Meander in the river Meuse, France
![Meanders in the river Cauto, Cuba](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_MeandersRioCauto.jpg)
Meanders in the river Cauto, Cuba
![Dry river channel and alluvial fan in Iran](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_DryRiverChannelAlluvialFanIran.jpg)
Dry river channel and alluvial fan in Iran
![Lene river delta, Siberia](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_DeltaLeneSiberia.jpg)
Lene river delta, Siberia
![Ganges river delta](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_GangesRiverDelta.jpg)
Ganges river delta
![River Ebro delta](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_DeltaEbro.jpg)
River Ebro delta
![Estuary](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Estuary2.jpg)
Estuary
![Coastal landforms](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_CoastalLandforms1.gif)
Coastal landforms
![Conglomerate](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Conglomerate1.jpg)
Conglomerate
![Breccia](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Breccia2.jpg)
Breccia
![Sandstone](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Sandstone03.jpg)
Sandstone
![Siltstone](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Siltstone2.jpg)
Siltstone
![Mudstone](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Mudstone1.jpg)
Mudstone
![Weathered limestone](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_LimestoneWeathered1.jpg)
Weathered limestone
![Chalk](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_LimestoneChalk1.jpg)
Chalk
![Fossiliferous limestone](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_LimestoneFossiliferous5.jpg)
Fossiliferous limestone
![Flysch of Zumaia (I)](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Zumaia-Flysch-1.jpg)
Flysch of Zumaia (I)
![Flysch of Zumaia (II)](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Zumaia-Flysch-2.jpg)
Flysch of Zumaia (II)
![Flysch de Zumaia (III)](https://img.sciencehelpdesk.com/thumbs/images/bg4_8_Zumaia-Flysch-3.jpg)
Flysch de Zumaia (III)