Physics
Thermohaline circulation is mainly due to

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

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Physics
A transformer

Converts DC to AC
Is used to decrease or increase AC voltage
Converts AC voltage to D.C. voltage
Converts electrical energy into mechanical energy

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