The layer of the Earth made up of solid rock is the crust.

Here's a bit more detail:

* Crust: The outermost layer of the Earth. It's relatively thin compared to the other layers, and it's divided into two types:

* Oceanic crust: Thinner and denser, made up of mostly basalt.

* Continental crust: Thicker and less dense, made up of mostly granite.

Let me know if you'd like to know more about the other layers of the Earth!