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  • Atmospheric Cycles and Environmental Processes
  • What is the percentage of oxygen in the atmosphere?
Multiple choice

What is the percentage of oxygen in the atmosphere?

  1. 10%

  2. 21%

  3. 52%

  4. 78%

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

 Oxygen constitutes 21% of the atmosphere.

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