Here's why:
* Igneous: This term means "formed by fire". Igneous rocks are created from the cooling and solidification of molten rock (magma or lava).
* Extrusive: This refers to the fact that the magma or lava erupted onto the Earth's surface.
Some common examples of extrusive igneous rocks include:
* Basalt: A dark-colored, fine-grained rock that is very common in volcanic areas.
* Rhyolite: A light-colored, fine-grained rock that is often found in areas with explosive volcanic eruptions.
* Andesite: A medium-colored, fine-grained rock that is found in a variety of volcanic settings.
* Obsidian: A glassy, volcanic rock that forms when lava cools very quickly.
Let me know if you'd like to learn more about any specific types of extrusive igneous rocks!
