The movement caused by warmer fluids rising and cooler fluids sinking is called convection currents.
What is convection current?
The convection currents are the outcome of differential heating. The less dense, that is, lighter warm substances rise, while the denser, that is, heavier cool substance sinks. It is this movement that generates patterns of circulation called convection currents, in water, in the atmosphere, and in the mantle of the Earth.
Thus, convection currents are the answer.
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