The principal constituent of the atmosphere of the Earth is

A. Oxygen
B. Carbon
C. Hydrogen
D. Nitrogen
E. None of above

Check Answer

The correct answer is D) Nitrogen.

The principal constituent of the Earth’s atmosphere is Nitrogen, it makes up about 78% of the total volume of the atmosphere. Nitrogen is an inert gas, which means that it does not react easily with other elements, and it does not support combustion. Oxygen makes up about 21% of the atmosphere, it is essential for human and animal life and it’s used in the process of respiration.

Carbon dioxide is present in small amounts, about 0.04% of the total volume of the atmosphere, it’s a greenhouse gas which plays a critical role in regulating the temperature on Earth. Trace amounts of other gases are also present in the atmosphere, including argon, neon, helium, methane, and water vapor.
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