What is siltation ?

Explanation

### Step-by-Step Solution:

1. **Definition of Siltation**: Siltation is a form of water pollution that occurs when fine particles, primarily silt and clay, accumulate in water bodies.

2. **Causes of Siltation**: The primary cause of siltation is soil erosion. When soil is eroded, it transports small particles (silt and clay) into rivers, lakes, and other water bodies.

3. **Process of Siltation**: As these particles are washed away from terrestrial areas, they become suspended in the water. Over time, they settle at the bottom of the water bodies, leading to a build-up of silt and clay.

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