Ecosystems · Botany

In the phosphorus cycle, what is the primary reservoir for phosphorus?

  1. The atmosphere
  2. Sedimentary rock
  3. The ocean surface
  4. Living plants
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Correct answer: Sedimentary rock

Unlike the carbon and nitrogen cycles, the phosphorus cycle does not involve a significant gaseous phase in the atmosphere. Phosphorus is mainly released from rocks through weathering and erosion.

Difficulty: Medium Question 6 of 20

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