What is the major process of extrusive (surface) rock formation on volcanoes?
Igneous Rocks are only formed underground.
The amount of time magma takes to cool determines the ____________________________ of the rock
Where are extrusive igneous rocks commonly found?
Basalt is an example of which type of rock?
Obsidian is an example of which kind of rock?
Diorite is an example of what type of rock?
Granite is an example of