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Nitrogen (78%) and oxygen (21%) are the two most common gases in the atmosphere.

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βˆ™ 13y ago
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Most of the early atmosphere was composed of hydrogen and helium. These elements were prevalent during the formation of the Earth, but later escaped into space due to the planet's relatively low gravity.

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Q: What are two elements that made up most of the early atmosphere?
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What are the 2 most important elements in the atmosphere?

The most important elements in the Earth's atmosphere are N (nitrogen) and O (oxygen).


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