Granite is a classic example of an intrusive igneous rock that forms deep beneath the Earth's surface. Here's why:

* Intrusive: This means the magma that formed the granite cooled and solidified *inside* the Earth's crust. It didn't erupt onto the surface.

* Igneous: This means the rock formed from the cooling and solidification of molten rock (magma or lava).

* Deep Formation: Granite typically forms at depths of several kilometers, where the pressure is immense and cooling occurs slowly. This slow cooling allows for the formation of large crystals, which is a characteristic of granite.

Let me know if you'd like to know more about granite or other types of igneous rocks!