GED Exam Prep: Science

Category - GED Science

Which two gasses are most abundant in the earth’s atmosphere?
  1. Nitrogen and oxygen
  2. Nitrogen and carbon dioxide
  3. Oxygen and carbon dioxide
  4. 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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