Multiple choice general knowledge science & technology

What is the main gas found in air we breathe?

  1. Oxygen

  2. Carbon-di-oxide

  3. Nitrogen

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

Nitrogen makes up about 78% of Earth's atmosphere by volume, making it the most abundant gas. Oxygen is second at about 21%, followed by argon at 0.93%. Carbon dioxide and hydrogen exist only in trace amounts (0.04% and negligible).

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