Exams › SSC CGL (Prelims) › General

Roughly what proportion of Earth's atmosphere is made up of nitrogen?

1. 58%
2. 68%
3. 78%
4. 88%

Correct answer: 78%

Solution

Nitrogen is the most abundant gas in Earth's atmosphere by volume, making up about 78%. Oxygen is about 21%, and the remaining gases form a very small fraction. Hence, 78% is correct.

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