The atmosphere is composed of various gases and is a thin layer of gas that surrounds the Earth. The most important layers of the Earth are the troposphere and the stratosphere. Roughly 90% of all molecules can be found in the troposphere layer. Air is a mixture of the various gases found in the atmosphere. The three main gases (and a small fourth gas) that composes the atmosphere are: Oxygen (21%), Nitrogen (78%), Carbon Dioxide (0.04%) and a fourth gas, Argon (0.9%). There are other gases, however, they are present in much smaller amounts.
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