Physics
Refrigeration is a process which

Slows down the bacterial growth
Plasmolyses the bacteria
Kills bacteria
Inactivates the bacteria

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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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