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[[Image:lighterstill.jpg]][[Image:Earthatmosphere.jpg|right|frame]]
'''Earth's atmosphere''' is a layer of [[gas]]es surrounding the planet [[Earth]] and retained by the Earth's [[gravity]]. It contains roughly (by molar content/volume) 78% [[nitrogen]], 20.95% [[oxygen]], 0.93% [[argon]], 0.038% [[Carbon dioxide in the Earth's atmosphere|carbon dioxide]], trace amounts of [[#Composition|other gases]], and a variable amount (average around 1%) of [[water vapor]]. This mixture of gases is commonly known as '''air'''. The atmosphere protects [[organism|life on Earth]] by absorbing [[ultraviolet]] [[solar radiation]] and reducing [[temperature]] extremes between day and night.
'''Earth's atmosphere''' is a layer of [[gas]]es surrounding the planet [[Earth]] and retained by the Earth's [[gravity]]. It contains roughly (by molar content/volume) 78% [[nitrogen]], 20.95% [[oxygen]], 0.93% [[argon]], 0.038% [[Carbon dioxide in the Earth's atmosphere|carbon dioxide]], trace amounts of [[#Composition|other gases]], and a variable amount (average around 1%) of [[water vapor]]. This mixture of gases is commonly known as '''air'''. The atmosphere protects [[organism|life on Earth]] by absorbing [[ultraviolet]] [[solar radiation]] and reducing [[temperature]] extremes between day and night.
# '''[[Exosphere]]''': from 500 – 1000 km (300 – 600 mi) up to 10,000 km (6,000 mi), free-moving particles that may migrate into and out of the [[magnetosphere]] or the [[solar wind]].
# '''[[Exosphere]]''': from 500 – 1000 km (300 – 600 mi) up to 10,000 km (6,000 mi), free-moving particles that may migrate into and out of the [[magnetosphere]] or the [[solar wind]].
The boundaries between these regions are named the [[tropopause]], [[stratopause]], [[mesopause]], [[thermopause]] and [[exobase]]. For more see: [http://en.wikipedia.org/wiki/Earth%27s_atmosphere]
The boundaries between these regions are named the [[tropopause]], [[stratopause]], [[mesopause]], [[thermopause]] and [[exobase]]. For more see: [https://en.wikipedia.org/wiki/Earth%27s_atmosphere]
[[Category: General Reference]]
[[Category: General Reference]]
[[Category: Earth Science]]
