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What is the reason for convection currents in the mantle?

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The Earth is comprised of huge layers, each of which has distinct characteristics. The majority of the Earth, about 80 percent, is made up of the mantle, which is the layer right next to the Earth's core, according to ThinkQuest.com. read more

The convection currents also help transfer heat from Earth's core, where magma is created through radioactive decay, to the mantle. This heat transfer continues through the layers of the crust until it reaches the surface. read more

Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over. Active radioactive materials below crust also contributes to some extent. read more

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