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When they get hotter, gasses and fluids have a lower density (they weigh less per cubic inch) so they rise above the cooler material.

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Most of the time a convection current happens within the Earth, in the layer which we call the mantle. Like the rock cycle, it has no certain beginning. Heated material becomes less dense. As it becomes less dense, it rises to the surface. At the surface, it cools, which causes it to become more dense, and that causes it to sink. It gets heated, and the process starts all over again.

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