Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
Boiling point decreases with rise of pressure
The material of the cooker is a good conductor
It cooks the food at low pressure

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Physics
Thermohaline circulation is mainly due to

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

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