In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?

1. A. Carbon cycle
2. B. Nitrogen cycle
3. C. Phosphorus cycle
4. D. Sulphur cycle

Answer: C

Explanation

Much of the phosphorus on Earth is tied up in rock and sedimentary deposits, from which it is released by weathering, leaching, and mining. Phosphorus moves in a cycle through rocks, water, soil and sediments and organisms. Over time, rain and weathering cause rocks to release phosphate ions and other minerals. This inorganic phosphate is then distributed in soils and water. Hence, option (c) is the correct answer.