Physics
Thermohaline circulation is mainly due to

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
Winds causing circulation of ocean water

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.
cohesion of water is greater than its adhesion with glass.

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