Physics
At the Curie temperature, the ferromagnetic materials get converted into

None of the others
Non-magnetic materials
Paramagnetic materials
Diamagnetic materials

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Physics
Thermohaline circulation is mainly due to

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

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