In essence, it's where hot stuff happens. Earth's upper mantle is separated into two layers, the lithosphere and the asthenosphere, though the lithosphere also contains Earth's crust. (Credit ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

Alternatively, as shown in the diagram, convection currents under the Earth’s crust transfer heat, which rises through the surface and cools back down in a circular motion. The convection ...

viscous (approximately stiff vs. pliable behavior) of lithospheric layers and the rate of deformation (strain rate) applied. In a laterally homogeneous lithosphere the stiff vs. pliable behavior ...