1. Crust: This is the thin, solid, rocky outer layer of the Earth. It's like the skin of an apple. It's divided into oceanic crust (thinner, denser) and continental crust (thicker, less dense).
2. Mantle: This is the thickest layer, made up of hot, dense rock. It's like the flesh of an apple. The upper mantle is mostly solid, while the lower mantle is closer to a very viscous fluid.
3. Outer Core: This layer is made up of liquid iron and nickel. The movement of this liquid metal creates the Earth's magnetic field.
4. Inner Core: This is the Earth's solid, innermost layer, mostly composed of iron with a temperature hotter than the surface of the sun. The intense pressure from all the layers above is what keeps the inner core solid despite its extreme temperature.
