The Earth consists of four layers: crust, mantle, outer core and inner core. Each layer has its own properties and characteristics that separates it from the other layers.
The crust, also known as the lithosphere, is the top layer and is made up of rock material. It is the thinnest layer, making up only 1 percent of the Earth. The mantle is below the crust and is the largest layer of the Earth. It is 1,802 miles long and makes up 80 percent of the planet. Below the mantle is the outer core, a ball of very hot metals. Finally, the inner core, which has very hot temperatures ranging from 9,000 to 13,000 F, is mostly solid iron.