Specifically, this type of igneous rock is classified as extrusive because it formed from lava that erupted onto the Earth's surface.
Here's a breakdown:
* Igneous rocks are formed from the cooling and solidification of magma (molten rock) or lava.
* Extrusive igneous rocks are formed when lava cools and solidifies on the Earth's surface.
* Intrusive igneous rocks are formed when magma cools and solidifies underground.
The specific type of extrusive igneous rock depends on the composition of the lava and the rate at which it cools. Examples include:
* Basalt: Dark-colored, fine-grained rock, common in oceanic crust.
* Rhyolite: Light-colored, fine-grained rock, often rich in silica.
* Andesite: Intermediate in color and composition between basalt and rhyolite.
