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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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