Multiple choice

Which of the following is not an example of a greenhouse gas?

  1. oxygen

  2. water vapor

  3. carbon dioxide

  4. methane
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen makes up about 21 percent of the atmosphere but does not trap heat, so it is not a greenhouse gas. Water vapor, carbon dioxide, and methane are all potent greenhouse gases.

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