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Commander Strax

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Why is there air?
The air as we know it was formed when plants began cracking carbon dioxide and producing oxygen. Before that, the atmosphere which had evaporated from the molten rock earth was after the collision with what became the moon contained mainly carbon dioxide and nitrogen.

Air is a mixture of gases which are too light to form liquids or solids at surface temperature and too heavy to escape earth's gravity. Main components are nitrogen (78%), oxygen (20%) and argon (1%). The rest are a range of other molecules as well as some solids or liquids suspended in small particles.
 
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