Earth's Layers

This is how to look at the Layers based on what each layer is actually made out of. Crust is light, less dense rock. Mantle is mostly silicate rocks, rich in magnesium and iron. The core is iron and nickel.

This is HOW the layers work. Lithosphere is the hard, rocky outer layer. Asthenosphere is the upper mantle that is slow moving due to convection. The Mesosphere is the hot middle part of earth that has massive convection currents. Outer Core is semi-liquid iron & nickel. Inner core is solid nickel & iron.