Physics
In a conductor

The valence band and the conduction band overlap each other
The forbidden energy gap is very wide
The forbidden energy gap is very narrow
There is no conduction band

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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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