Physics
The wall of a dam is broader at the base

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

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Physics
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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