Multiple choice

Carbon dioxide makes up approximately what percentage of the atmosphere?

  1. 3.9%

  2. 0.039%

  3. 0.0045%

  4. 6%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide is a trace gas in the atmosphere, making up approximately 0.04 percent of the total volume. 0.039 percent is the commonly cited historical value.

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