Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with increase of temperature
Does not depend on temperature
Decreases with decrease of temperature

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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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