Which gas is listed as a major component of Earth's atmosphere?

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Multiple Choice

Which gas is listed as a major component of Earth's atmosphere?

Explanation:
Nitrogen is the major component of Earth's atmosphere because it makes up the largest portion of air by volume, about 78%. That sheer dominance means it sets the baseline composition of the air we breathe. Oxygen is also abundant, but it is not the top constituent, comprising around 21%. The remaining gases—like argon, carbon dioxide, neon, and others—exist in trace amounts, and ammonia is not present in the atmosphere as a major component. Argon, being a noble gas, appears only in tiny fractions. So nitrogen stands out as the primary gas, which is why it’s the correct choice.

Nitrogen is the major component of Earth's atmosphere because it makes up the largest portion of air by volume, about 78%. That sheer dominance means it sets the baseline composition of the air we breathe. Oxygen is also abundant, but it is not the top constituent, comprising around 21%. The remaining gases—like argon, carbon dioxide, neon, and others—exist in trace amounts, and ammonia is not present in the atmosphere as a major component. Argon, being a noble gas, appears only in tiny fractions. So nitrogen stands out as the primary gas, which is why it’s the correct choice.

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