Multiple choice general knowledge

The major constituent of air is

  1. nitrogen

  2. oxygen

  3. hydrogen

  4. carbon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrogen makes up approximately 78% of Earth's atmosphere by volume, making it the most abundant gas. Oxygen is the second most abundant at about 21%, while hydrogen and carbon dioxide exist only in trace amounts (less than 1%).

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