Here's a breakdown:
* Crust: The thin, outermost layer of the Earth, composed of solid rock.
* Mantle: The thickest layer, mostly solid rock but with a partially molten layer called the asthenosphere.
* Outer Core: A liquid layer of iron and nickel, about 2,200 kilometers (1,367 miles) thick.
* Inner Core: A solid ball of iron and nickel, about 1,220 kilometers (758 miles) in radius.
The movement of the liquid iron in the outer core is responsible for generating Earth's magnetic field.
