Multiple choice general knowledge science & technology

Of which gas is the atmosphere primarily made up?

  1. Carbon Dioxide (CO2)

  2. Oxygen (O2)

  3. Water (H2O)

  4. Nitrogen (N2)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Earth's atmosphere is composed of approximately 78% Nitrogen (N2) and 21% Oxygen (O2). Carbon dioxide and water vapor exist only in much smaller, trace amounts.

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