Extrusive igneous rocks are formed by magma ... The Devil’s Tower in Wyoming, USA is a famous igneous rock formation. It was originally formed underground but the sedimentary rocks around ...

This process can occur either below the Earth’s surface, forming intrusive or plutonic igneous rocks like granite, or at the ...

are formed by magma from the molten interior of the Earth. If magma erupts on the surface as lava, it will form extrusive rock, e.g. basalt. These rocks are formed when magma solidifies.