How do igneous rocks melt?
They are melted by lava on the surface or magma in the crust.
Main Idea: Igneous rocks are formed when magma erupts from a volcano and hardens on the surface in the form of lava.
Extrusive (on the surface of the volcano) igneous rocks can be in the form of:
Intrusive (in the crust of the volcano) rocks can be in the form of: