Wikipedia - Earth's Atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen, trace amounts of other gases, and water vapor. This mixture of gases is commonly known as air.More Information » Site Details | Report This Site http://en.wikipedia.org/wiki/Earth's_atmosphere
The Earth's Atmosphere The present atmosphere of the Earth is probably not its original atmosphere. Our current atmosphere is what chemists would call an oxidizing atmosphere, while the original atmosphere was what chemists would call a reducing atmosphere. In particular, it probably did not contain oxygen.More Information » Site Details | Report This Site http://csep10.phys.utk.edu/astr161/lect/earth/atmosphere.html
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