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

The air we breathe is approximately 78% nitrogen, 21% oxygen, and 1% other gases (argon, carbon dioxide, etc.). So nitrogen is the most common gas, making oxygen the second most common. Carbon dioxide, while important for climate, makes up only about 0.04% of the atmosphere.

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