Physics
The instrument used to see the distant objects on the Earth is

Astronomical telescope
Simple microscope
Compound microscope
Terrestrial telescope

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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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