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Image that says Spheres. Image of the Sun with the Earth and a comet in the background.

Exosphere
Earth is not alone in the universe! Even though the objects out there are a long ways away, they still affect us. The Sun is 93 million miles away, but it still provides the light plants need in order to grow. The Sun also provides the heat that keep the surface of Earth warm. If we didn't have heat and light from the Sun, we would all quickly become part of the cryosphere. Yuk! Not a pleasant thought!

Sometimes we get visitors from the exosphere such as comet dust (which makes the meteors we see at night) and meteorites (which we see in museums). Very occasionally we get unwelcome visitors such as asteroids and comet heads that explode in the atmosphere or hit the ground and explode to make huge craters and change Earth's climate. Many people think that 65 million years ago one of these giant impacts caused the dinosaurs to become extinct.

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Spheres
Lithosphere
Hydrosphere
Cryosphere
Biosphere
Atmosphere
Image of a star. Exosphere
  Exact Spheres
 
             
     
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Spheres | Lithosphere | Hydrosphere | Cryosphere | Biosphere | Atmosphere | Exosphere | Exact Spheres

Diversity | Adaptation | Plate Tectonics | Cycles | Spheres | Biomes | Geologic Time

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Last updated on
April 28, 2005

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