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This gas makes up close to one fourth of the air surrounding earth

User Bangalore
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Oxygen makes up about 21% of the earth's atmosphere and 78% is nitrogen with 1% other gases
User Rovshan
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Welllll, it's not really that close to one fourth.

One fourth is 25%.

The closest one is oxygen, which comprises about 18% of the air.
User Ali Yaghoubi
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