Which gas is the second most abundant in Earth's atmosphere?

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Multiple Choice

Which gas is the second most abundant in Earth's atmosphere?

Explanation:
Two gases dominate Earth's atmosphere: nitrogen and oxygen. Nitrogen makes up the largest share by volume, and oxygen is the next largest, comprising about one-fifth of the air. The rest of the atmosphere consists of trace amounts of other gases, like argon and neon, which are present far less than oxygen. Because of this, oxygen is the second most abundant gas in the atmosphere.

Two gases dominate Earth's atmosphere: nitrogen and oxygen. Nitrogen makes up the largest share by volume, and oxygen is the next largest, comprising about one-fifth of the air. The rest of the atmosphere consists of trace amounts of other gases, like argon and neon, which are present far less than oxygen. Because of this, oxygen is the second most abundant gas in the atmosphere.

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