Multiple choice

Which gas forms 95% of Mars's atmosphere?

  1. Methane

  2. Carbon dioxide

  3. Nitrogen

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

Mars' atmosphere is composed of approximately 95% carbon dioxide, with about 2.7% nitrogen and 1.6% argon. The high concentration of CO2 creates a strong greenhouse effect, though the thin atmosphere overall prevents significant heat retention.

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