The earth's atmosphere contains over _____ % by volume of nitrogen gas:
Correct answer: C. 78
- A. 58
- B. 68
- C. 78
- D. None of these
Explanation
Nitrogen makes up approximately 78% of Earth’s atmosphere by volume, mainly as N₂ gas. Oxygen accounts for about 21%, which is the common distractor.
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Practise Forest Ecology
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