Here's a breakdown of the Earth's layers:
* Crust: The outermost layer, relatively thin and composed of solid rock. It's what we live on!
* Mantle: A thick layer mostly composed of solid rock, but with a partially molten layer called the asthenosphere.
* Outer Core: A liquid layer primarily made of iron and nickel.
* Inner Core: A solid ball of iron and nickel, incredibly hot due to pressure.
