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Geography - World & Indian (Atmosphere):

Written By STPORTAL on Sunday, March 18, 2012 | 2:55 PM

Geography - World & Indian (Atmosphere):

Composition of the Atmosphere
The present atmosphere of the Earth is probably not its original atmosphere. The original atmosphere may have been similar to the composition of the solar nebula and close to the present composition of the Gas Giant planets. The earlier atmosphere was lost to space, and replaced by compounds outgassed from the crust or (in some more recent theories) much of the atmosphere may have come instead from the impacts of comets and other planetesimals rich in volatile materials.

The oxygen so characteristic of our atmosphere was almost all produced by plants (cyanobacteria or, more colloquially, blue-green algae). Thus, the present composition of the atmosphere is 79% nitrogen, 20% oxygen, and 1% other gases.

Layers of the Atmosphere
The atmosphere of the Earth may be divided into several distinct layers, as the following figure indicates.

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