Here's why:

* Magma: Molten rock found beneath the Earth's surface.

* Cooling: When magma rises to the surface (as lava) or cools underground, it solidifies.

* Igneous Rock: The rock formed from the cooling and solidification of magma or lava.

There are two main types of igneous rock, depending on where the magma cooled:

* Extrusive Igneous Rock: Formed from lava that cools on the Earth's surface, like basalt and rhyolite.

* Intrusive Igneous Rock: Formed from magma that cools underground, like granite and gabbro.

So, whether it's a massive granite formation or a small pebble of basalt, it all starts with a layer of cooled magma!