Here's a breakdown:

* Crust: This is the outermost layer, relatively thin compared to the other layers. It's made of solid rock, primarily basalt and granite.

* Mantle: This layer lies beneath the crust and is mostly solid, but it behaves like a very viscous fluid over long periods.

* Outer Core: This layer is liquid, primarily composed of iron and nickel.

* Inner Core: This is the innermost layer, and it's solid despite the intense heat due to immense pressure.