Melted rock that cools and hardens beneath the Earth's surface forms igneous intrusive rocks.

Here's a breakdown:

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

* Intrusive: Rocks that form when magma cools and solidifies *inside* the Earth's crust.

Some examples of igneous intrusive rocks include:

* Granite: A light-colored, coarse-grained rock.

* Gabbro: A dark-colored, coarse-grained rock.

* Diorite: A medium-colored, coarse-grained rock.

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