Multiple choice

Which one of the following contributes largely to the greenhouse effect?

  1. Ozone

  2. Water vapor

  3. Carbon monoxide

  4. Carbon dioxide

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Water vapor is the largest contributor to the Earth's greenhouse effect. On an average, it probably accounts for about 60% of the warming effect.

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