Why does the thickness of the wall of a dam gradually increase with the depth of water?

Explanation

To understand why the thickness of the wall of a dam gradually increases with the depth of water, we can break it down into several steps:

### Step-by-Step Solution:

1. **Understanding Pressure in Fluids**:
- The pressure exerted by a fluid at a certain depth is given by the formula:
\[
P = \rho g h
...