A long term global cycle which is linked by water and in which sea floor rising play an important role is

Options

A. Water cycle
B. Carbon cycle
C. Phosphorus cycle
D. Carbon and nitrogen cycle

Explanation

To solve the question about the long-term global cycle linked by water, where sea floor rising plays an important role, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Terms**: The question mentions a "long term global cycle," "linked by water," and "sea floor rising." This suggests we are looking for a biogeochemical cycle that involves water and geological processes.

2. **Analyze the Options**: The options provided are:
- Water cycle
- Carbon cycle
- Phosphorus cycle
- Carbon and nitrogen cycle

3. **Consider the Role of Water**: The water cycle primarily involves the movement of water through evaporation, condensation, and precipitation. While important, it does not specifically address sea floor rising.

4. **Examine the Carbon Cycle**: The carbon cycle involves the movement of carbon through the atmosphere, oceans, and living organisms. It is significantly influenced by oceanic processes, including the absorption of carbon dioxide by seawater and the role of marine organisms in carbon storage.

5. **Link to Sea Floor Rising**: The carbon cycle is affected by geological processes, including the rising and sinking of the sea floor, which can impact carbon storage in ocean sediments. This makes the carbon cycle a strong candidate for the answer.

6. **Evaluate Other Options**:
- The phosphorus cycle does not primarily involve water in the same way and is not linked to sea floor processes.
- The carbon and nitrogen cycle, while relevant, does not specifically highlight the role of sea floor rising as prominently as the carbon cycle does.

7. **Conclude the Answer**: Based on the analysis, the long-term global cycle that is linked by water and in which sea floor rising plays an important role is the **carbon cycle**.

### Final Answer:
**B. Carbon Cycle**

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