Cool enough to increase in density and sink.
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The core of the earth contains radioactive material and this causes a convection current in the mantle.
When a material becomes hot enough, it rises because it less dense.
Convection currents in the earth originate in the mantle. The liquid moves in a circle pattern as the hotter magma rises and the cooler magma falls. This can also be observed in any fluid material, gases or liquids.
a convection current occurs when a potato picked by a farmer falls off the wagon and is eaten by a donkey ps: your welcome
In a convection current, heat flows with the heated molecules as they move around in the liquid or gas. In a solid, the heat transfers via condition