Which gas makes up over 75 of the earth's atmosphere?
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By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. read more
Source: en.wikipedia.org
The lowest layer is known as the troposphere, which makes up approximately 75% of the total mass of the atmosphere and contains 99% of the atmosphere’s water. The troposphere extends up to approximately 11 kilometers (7 miles) from the surface and is the layer where atmospheric gases are most concentrated. read more
Source: ces.fau.edu
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