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