Physics
The wall of a dam is broader at the base

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

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape
Should be in the form of a vertical rod
Should be made of a good conductor but can be of any shape

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Physics
Thermohaline circulation is mainly due to

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

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