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It depends which atmosphere you mean.

The Earth's atmosphere is (not counting water vapour, which varies between 1 and 5% at the surface) 78% nitrogen, 20% oxygen, 1% argon and 1% other gasses (mainly carbon dioxide)

It is divided into many layers. The lowest is the troposphere, where all the weather happens and is the part planes fly in. Directly above that is the stratosphere and above that is the mesosphere. Then the thermosphere (this is seriously high, we're talking space stations and shuttles now). And finally the exosphere, which is mainly hydrogen and helium.

Within these layers are other divisions like the ozone layer in the stratosphere where almost all of the ozone is found.

Mars' atmosphere is very dry and composed mainly of carbon dioxide.

Venus' is very dense and sulphur-rich.

Jupiter and Saturn both have largely hydrogen and helium bases atmospheres while Saturn's moon Titan has a very thick atmosphere made up almost entirely of nitrogen.

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15y ago

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