Physics
Velocity of sound in air does not depend on

Temperature of air
Humidity of air
Density of air
Pressure of air

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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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