Physics
In a conductor

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

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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
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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