Which biogeochemical cycle is fully balanced?

Explanation

**Step-by-Step Solution:**

1. **Identify Biogeochemical Cycles**: Begin by listing the major biogeochemical cycles. These include the carbon cycle, nitrogen cycle, nutrient cycle, oxygen cycle, phosphorus cycle, sulfur cycle, rock cycle, and water cycle.

2. **Understand the Concept of a Balanced Cycle**: A fully balanced biogeochemical cycle is one where the inputs and outputs of the cycle are equal, meaning that the elements involved are recycled without any net loss or accumulation in the ecosystem.

3. **Examine Each Cycle**: Analyze each of the listed cycles to determine if they are balanced. For example:
- **Carbon Cycle**: Involves carbon fixation and respiration, but can be disrupted by human activities.
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