Multiple choice

Which of the following is NOT involved in the nitrogen cycle?

  1. Bacteria

  2. Lightning

  3. Fertilizer

  4. Rocks
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The nitrogen cycle involves biological processes (bacteria), atmospheric processes (lightning), and human inputs (fertilizer). Rocks are primarily associated with the phosphorus or rock cycles, not the nitrogen cycle.

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