The layer of Earth made mostly of granite and rocks is the crust.

Here's why:

* Continental Crust: This is the thicker part of the crust, typically made up of granite, a light-colored igneous rock. It forms the landmasses we live on.

* Oceanic Crust: This is the thinner part of the crust, primarily composed of basalt, a dark-colored igneous rock. It underlies the ocean basins.

While there are other layers below the crust, like the mantle and core, they are primarily composed of different materials like iron, nickel, and silicate minerals.