1. Inner Core: This is a solid ball of mostly iron and nickel, with temperatures reaching over 5,200° Celsius (9,392° Fahrenheit). The immense pressure at this depth prevents the iron from melting, even though it's incredibly hot.

2. Outer Core: Surrounding the inner core is the liquid outer core, also primarily composed of iron and nickel. This layer is less dense than the inner core and is thought to be responsible for Earth's magnetic field.

3. Mantle: The mantle is the thickest layer, made up of mostly silicate rocks. It's semi-solid, like very thick honey, and is responsible for plate tectonics and volcanic activity.

Please note that there is no layer directly above the mantle. It's followed by the Earth's crust, which is the thin, solid outer layer that we live on.