Multiple choice general knowledge science & technology

What is the second most common gas found in the air we breathe

  1. Carbon dioxide

  2. oxygen

  3. Nitrogen

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earth's atmosphere is 78% nitrogen (most common), 21% oxygen (second most common), and only about 0.04% carbon dioxide. Despite what many assume, oxygen is indeed the second-largest component of air.

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