Physics
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Increases with depth of the wall
Depends on the thickness of the wall
Depends on the area of the wall
Increases with height of the wall

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Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of adhesion are large
The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them

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