Why are nutrient cycles in nature called biogeochemical cycles?

Explanation

**Step-by-Step Solution:**

1. **Definition of Nutrient Cycles:**
Nutrient cycles refer to the natural pathways through which essential elements necessary for life are circulated in the environment. These cycles ensure that nutrients are reused and made available to living organisms.

2. **Understanding Biogeochemical:**
The term "biogeochemical" combines three aspects:
- **Bio:** Relating to living organisms (biological aspects).
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