Physics
The period of revolution of a geostationary satellite is

24 hours
Changing continuously
30 days
365 days

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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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