When melted rock (magma) reaches Earth's surface, it's called lava. The igneous rock formed from this lava is called extrusive igneous rock.

Here are some common examples of extrusive igneous rocks:

* Basalt: A dark-colored, fine-grained rock that is very common.

* Rhyolite: A light-colored, fine-grained rock that is often found in volcanic areas.

* Andesite: A medium-colored, fine-grained rock that is also common in volcanic areas.

* Obsidian: A black, glassy rock that forms when lava cools very quickly.

* Pumice: A light, porous rock that forms when lava with a lot of gas bubbles cools quickly.

Let me know if you'd like to learn more about a specific type of extrusive igneous rock!