Yes, lava turns into a rock when it cools. This is how igneous rocks are formed.

Here's a breakdown:

* Lava: Molten rock that erupts from a volcano.

* Cooling: As lava cools, it loses heat and its chemical composition changes.

* Solidification: As the lava continues to cool, it becomes solid, forming an igneous rock.

The type of igneous rock that forms depends on the composition of the lava and how quickly it cools.

Let me know if you'd like to learn more about the different types of igneous rocks!