Environment And Road Safety Education And Violence Against Women And Children And Drug Abuse 2017 Exam With Answers

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9.

Nitrogen constitute ......% of the atmosphere :

A: 79

B: 21

C: 57

D: 42

The answer is: A

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Explanation

Nitrogen constitutes approximately 78% of the Earth's atmosphere.

Oxygen accounts for about 21% of the atmosphere, while other gases, such as argon, carbon dioxide, and trace amounts of other gases, make up the remaining percentage. Oxygen is crucial for supporting life, while nitrogen plays a role in various biological and chemical processes.