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HiSET Science Test Prep

Category - HiSET Science Practice Test Questions

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Which two gasses are most abundant in the earth’s atmosphere?

Nitrogen and oxygen
Nitrogen and carbon dioxide
Oxygen and carbon dioxide
Oxygen and hydrogen

Explanation

Answer: A - Nitrogen and oxygen are the two most abundant gasses in the earth’s atmosphere. Approximately 78% of the earth’s atmosphere is composed of nitrogen. Approximately 21% of the earth’s atmosphere is composed of oxygen.

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