If you need a technical summary of igneous rock classification, then this resource is worth checking out. It has several different diagrams to help you visualize the classification process.

This resource provides a description of igneous rock, its origin and the types of rock that are formed from a volcanic eruption.

[Free Registration/Login may be required to access all resource tools.] Determination of intrusive and extrusive igneous rocks.

A journey into the depths of a volcano teaches students about volcanic rocks, eruptions, features, and locations. Also find out how volcanologists monitor activity and conduct scientific research on eruptions.

The minerals that make up igneous rocks crystallize at a range of different temperatures. The sequence in which minerals crystallize from magma is known as the Bowen reaction series. An explanation of the reaction series is provided...