* Crust

* Mantle

* Outer Core

* Inner Core

The Crust

- The outermost layer of Earth.

- Thin, solid layer of rock that forms the continents and ocean basins.

- Relatively cool and rigid.

- Thickness ranges from 5 to 70 km.

The Mantle

- Located beneath the crust.

- Thick layer of hot, dense rock.

- Makes up about 84% of Earth's volume.

- Convection currents in the mantle drive plate tectonics.

The Outer Core

- Located beneath the mantle.

- Liquid layer of iron and nickel.

- About 2,260 km thick.

- Convection currents in the outer core generate Earth's magnetic field.

The Inner Core

- Located at the center of Earth.

- Solid ball of iron and nickel.

- About 1,220 km in radius.

- Extremely hot and dense.