Physics
A spring is an example of which of these

Conservation of mass law
Newton's 3rd law
Newton's 1st law
Hooke's law

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

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