Physics
The wall of a dam is broader at the base

To withstand pressure that increases with depth
Because streamlining is required
To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure

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Physics
Solids have definite shapes.This is because

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

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