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

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

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Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
Warmer, less dense water sinking in the ocean and cold water replacing it
Cold, dense ocean water sinking and warmer water replacing it
Warm water being added to the ocean due to industial waste

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