| Vertical Structure of Composition |
| up
to ~500km |
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|
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| Dominated by lighter gases |
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| with increasing altitude, such |
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| as
hydrogen and helium. |
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| Heterosphere |
| ~80km |
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|
|
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|
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| This part of the atmosphere |
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| continually circulates, so that |
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| the principal atmospheric |
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| gases are well mixed. |
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| è For most purpose, we |
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| consider the homosphere |
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| virtually the entire |
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| atmosphere. |
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| Homosphere |