Multiple choice

The major constituent of air is _____.

  1. N

  2. O

  3. S

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Depending on various geographical locations these may change, but for the most part, air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4), hydrogen (H2), argon (Ar) and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of air.

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