Earth's Layers

Outer Core-State:

Molten liquid

Outer Core

Most of the rock is Earth's outer core is molten, which means that it acts like a hot liquid. The outer core begins about 2900 kilometers below Earth's surface.

Inner Core-Thickness:

Radius is about 1300 kilometers

Inner Core

Earth's inner core is incredibly dense, because it is under so much pressure. The inner core begins at a depth of about 5150 kilometers below Earth's surface.

Crust-Thickness:

5 to 64 kilometers (varies depending on which type of crust)

Outer Core-Thickness:

About 2250 kilometers

Mantle-Thickness:

About 2900 kilometers

Mantle-State:

Considered solid, but has the quality of plasticity, which means the solid rock in this layer can flow like a thick liquid.

Crust-State:

Solid

Inner Core-State:

Solid

Crust

The crust is the outermost layer of Earth. This layer, on which life exists, is covered with soil, rock, and water. Relative to the thickness of Earth's other layers, Earth's crust can be compared in thickness to the shell of an egg or the skin of an apple. The crust is thickest under the continents and thinnest under the oceans.

Mantle

The mantle is Earth's thickest layer. About 80% of the volume of Earth is contained in Earth's mantle, which extends from the base of the crust to the liquid outer core. The mantle is generally considered to exist in a solid state, although high temperatures and pressure can cause some of this solid rock to flow like an extremely thick liquid.