Mention name of two elements where reservoir pool is lithosphere.

Explanation

To answer the question about two elements where the reservoir pool is the lithosphere, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Reservoir Pool**:
- A reservoir pool refers to a large storage area for elements in the biogeochemical cycles. In this context, the lithosphere (the rigid outer part of the Earth) serves as a reservoir pool for certain elements.

2. **Identify the Types of Biogeochemical Cycles**:
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