Which gas constitutes the largest portion of Earth's atmosphere?

Prepare for the Life Span and AandP Test with detailed questions covering growth, development, human anatomy, and physiology. Understand concepts with hints and explanations to ace your exam!

Multiple Choice

Which gas constitutes the largest portion of Earth's atmosphere?

Explanation:
The air we breathe is dominated by a single gas by volume: nitrogen. About 78 percent of Earth's atmosphere is nitrogen, while oxygen makes up roughly 21 percent. The remaining tiny amounts come from trace gases like argon and carbon dioxide. Nitrogen is so abundant because it is relatively inert and stays in the gas phase, not readily forming compounds that would remove it from the atmosphere. Oxygen, though essential for life, is more reactive and part of various cycles, keeping its amount lower than nitrogen. That’s why nitrogen constitutes the largest portion of the atmosphere.

The air we breathe is dominated by a single gas by volume: nitrogen. About 78 percent of Earth's atmosphere is nitrogen, while oxygen makes up roughly 21 percent. The remaining tiny amounts come from trace gases like argon and carbon dioxide. Nitrogen is so abundant because it is relatively inert and stays in the gas phase, not readily forming compounds that would remove it from the atmosphere. Oxygen, though essential for life, is more reactive and part of various cycles, keeping its amount lower than nitrogen. That’s why nitrogen constitutes the largest portion of the atmosphere.

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