Physics
Boyle's law is a relationship between

Pressure and temperature
Volume and temperature
Pressure and volume
Volume and density

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Physics
Thermohaline circulation is mainly due to

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
Warmer, less dense water sinking in the ocean and cold water replacing it

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