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2014-07-12T16:53:33+08:00

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An atmosphere is a layer of gases surrounding a planet or other material body of sufficient mass that is held in place by the gravity of the body. 

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2014-07-12T20:48:51+08:00

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The functions of this is envelope of gases surrounding the earth or another planet. to doesn't burn your skin and to breath.to have a gravity you weight to doesn't fly like in the atmospehere
>Hope it helps
don't copy my answer,it is based on my mind !!
From: TaengPark
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