What causes the warm air to rise up, cool down and then sink?

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Conduction current

Radiation

Convection Current

Destructive current

answer is C.

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Detailed Solution

Warm air being less dense rises up and the cool air being dense sinks and takes place of the warm air.
The warm air releases heat and becomes cool as it goes up and sinks when more warm air rises up.
This is a method of heat transfer called convection.

Therefore, we can say that convection current causes the warm air to rise up, cool down and then sink.

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