Which of the following nutrient cycles have nothing do with atmosphere

Options

A. Carbon cycle
B. Nitrogen cycle
C. Phosphorous cycle
D. Oxygen cycle

Answer

To determine which nutrient cycle has nothing to do with the atmosphere, we will analyze each of the given options: carbon cycle, nitrogen cycle, phosphorus cycle, and oxygen cycle.

### Step-by-Step Solution:

1. **Understanding the Nutrient Cycles**:
- We need to understand what each nutrient cycle involves and whether it interacts with the atmosphere.

2. **Carbon Cycle**:
- The carbon cycle involves the exchange of carbon in various forms (like carbon dioxide) between the atmosphere, hydrosphere, and lithosphere.
- Since carbon dioxide is a gas found in the atmosphere, this cycle is **not** the correct answer.

3. **Nitrogen Cycle**:
- The nitrogen cycle includes processes such as nitrogen fixation, nitrification, and denitrification, which predominantly occur in the atmosphere.
- Approximately 75% of the nitrogen cycle involves the atmosphere, making this option also **not** the correct answer.

4. **Phosphorus Cycle**:
- The phosphorus cycle is unique because it does not have a gaseous phase. Phosphorus primarily moves through the lithosphere (rocks), hydrosphere (water), and biosphere (living organisms).
- Since there is no gaseous state of phosphorus, the atmosphere is **not involved** in this cycle, making it the correct answer.

5. **Oxygen Cycle**:
- The oxygen cycle involves the exchange of oxygen, which is a gas, between the atmosphere, hydrosphere, and lithosphere.
- Since oxygen is present in the atmosphere, this cycle is also **not** the correct answer.

### Conclusion:
The nutrient cycle that has nothing to do with the atmosphere is the **phosphorus cycle**.

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