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) is the largest nitrogen reservoir, containing approximately 78% nitrogen gas (N2) by volume. This represents about 4×10^21 tons of nitrogen. While soil contains nitrogen in organic and inorganic forms, and the sea contains dissolved nitrogen, neither compares to the massive atmospheric reservoir. Rocks contain minimal nitrogen.

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