Where are igneous rocks formed?

Hypabyssal rock is a form of intrusive igneous rock that solidifies at medium to shallow depths within the crust, usually in fissures as dikes and intrusive sills. These rocks typically have an intermediate grain size and texture between that of intrusive and extrusive rock. read more

Extrusive Igneous Rocks; Extrusive igneous rocks are formed when molten magma spill over to the surface as a result of volcanic eruption. The magma on the surface (lava) cools faster on the surface to form igneous rocks that are fine grained. Examples of such kind of rocks include pumice, basalt, or obsidian. read more

This type of igneous rock tends to be much larger and has a coarse texture. Extrusive rocks are usually found near volcanoes or fissures in the Earth's crust where magma has erupted. These tend to be much smaller and have a very smooth texture. read more