Multiple choice

Which of the following is the largest reservoir of nitrogen?

  1. Rocks

  2. Sea

  3. Air

  4. Soil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The atmosphere (air) contains approximately 78% nitrogen gas (N2), making it by far the largest reservoir of nitrogen on Earth. While the ocean contains dissolved nitrogen, soil contains organic nitrogen compounds, and rocks contain nitrogen in minerals, none of these compare to the vast atmospheric reservoir.

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