Multiple choice general knowledge science & technology

What is the most common gas in the earth's atmosphere

  1. Nitrogen

  2. Oxygen

  3. Hydrogen

  4. Helium
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A Correct answer
Explanation

Nitrogen makes up approximately 78% of Earth's atmosphere by volume, making it the most abundant gas. Oxygen is second at about 21%, while hydrogen and helium are trace gases (less than 1% combined). This composition is relatively uniform up to about 80km altitude.

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