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

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Prepare for the NES Earth and Space Science (307) Test. Use flashcards and multiple-choice questions with explanations to enhance your understanding and boost your confidence. Excel in your exam preparation!

Multiple Choice

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

Explanation:
The amount of gas in the air is about the percent by volume of each gas. Nitrogen is the most abundant, making up roughly 78% of dry air, followed by oxygen at about 21%, with argon and carbon dioxide present only in tiny amounts. Nitrogen predominates because N2 is chemically very unreactive and stays in the atmosphere rather than being removed by chemical reactions or biological processes. Oxygen, though essential for life, participates in many reactions and cycles, so its share remains smaller than nitrogen’s. The trace gases, argon and CO2, are present in much smaller amounts and don’t come close to nitrogen’s abundance.

The amount of gas in the air is about the percent by volume of each gas. Nitrogen is the most abundant, making up roughly 78% of dry air, followed by oxygen at about 21%, with argon and carbon dioxide present only in tiny amounts. Nitrogen predominates because N2 is chemically very unreactive and stays in the atmosphere rather than being removed by chemical reactions or biological processes. Oxygen, though essential for life, participates in many reactions and cycles, so its share remains smaller than nitrogen’s. The trace gases, argon and CO2, are present in much smaller amounts and don’t come close to nitrogen’s abundance.

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