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Atmosphere
Body of air/gases that surrounds the planet
How much nitrogen makes up the atmosphere
78%
How much oxygen makes up the atmosphere
21%
Exosphere
Outermost layer, merging with space: hydrogen + helium
Thermosphere
Ionosphere, high temp the because of solar radiation
Mesosphere
Coldest layer, where meteors burn
Troposphere
Surface to 12km, where weather occurs