The earth's atmosphere

ABOUT
ATMOSPHERE

The area near the surface of the earth can be divided up into four inter-connected "geo-spheres:" the lithosphere, hydrosphere, biosphere, and atmosphere. Scientists can classify life and material on or near the surface of the earth to be in any of these four spheres.


	The earth's atmosphere ................................................. The Four Spheres of the Earth : ................................................. Lithosphere Hydrosphere Biosphere Atmosphere ................................................. Layers of the Atmosphere : ................................................. Troposphere Stratosphere Mesosphere Thermosphere Exosphere Pauses .................................................
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The names of the four spheres are derived from the Greek words for stone (litho), air (atmo), water (hydro), and life (bio).

The earth's atmosphere near the surface is composed primarily of Nitrogen and Oxygen. Together, the two comprise about 99% of the gas in the atmosphere. Here's a listing of the key components of the lower atmosphere...

Nitrogen - 78.084%
Oxygen - 20.95%
Argon - 0.934%
Carbon Dioxide - 0.036%
Neon - 0.0018%
Helium - 0.0005%
Methane - 0.00017%
Hydrogen - 0.00005%
Nitrous Oxide - 0.00003%
Ozone - 0.000004%

In addition, water vapor is variable but typically makes up about 1-4% of the atmosphere.

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