Physics
The Hooke's law is valid for

Entire stress strain curve
Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire elastic region of the stress strain curve

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Physics
Thermohaline circulation is mainly due to

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

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