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  • Atmosphere Online Quiz
  • What is the most abundant gas in Earth's atmosphere?
Multiple choice

What is the most abundant gas in Earth's atmosphere?

  1. oxygen

  2. hydrogen

  3. nitrogen

  4. carbon

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78% of the air we breathe. Oxygen is the second most abundant at 21%.

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