Identify the gas that is the second most abundant in Earth's atmosphere.

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Multiple Choice

Identify the gas that is the second most abundant in Earth's atmosphere.

Explanation:
Oxygen is the second most abundant gas in Earth's atmosphere. The air is mostly nitrogen, making up about 78%, with oxygen close behind at about 21% by volume. The remaining gases are present only in tiny amounts: argon around 0.93%, carbon dioxide about 0.04%, and neon far less than that. So oxygen is the next most plentiful gas after nitrogen, remaining far more abundant than the other gases listed. (Note: carbon dioxide has risen in recent centuries due to human activity, but its fraction is still only a small part of the atmosphere compared with oxygen.)

Oxygen is the second most abundant gas in Earth's atmosphere. The air is mostly nitrogen, making up about 78%, with oxygen close behind at about 21% by volume. The remaining gases are present only in tiny amounts: argon around 0.93%, carbon dioxide about 0.04%, and neon far less than that. So oxygen is the next most plentiful gas after nitrogen, remaining far more abundant than the other gases listed. (Note: carbon dioxide has risen in recent centuries due to human activity, but its fraction is still only a small part of the atmosphere compared with oxygen.)

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