Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
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

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The sea is wider than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water

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