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No one gas comprises 99% of the atmosphere, but nitrogen (~78.09%) and oxygen (~20.95%) together comprise about 99% of the atmosphere (on a dry basis, i.e. not including water vapor which can range from near 0% to 5%).

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7y ago
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7y ago

Nitrogen 80%

Oxygen 20%

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Q: Which gases form 99 percent of Earth's atmosphere?
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