Students use chocolate in this activity to model sedimentary, metamorphic, and igneous rocks, mimicking what happens during transformations in the rock cycle.

Describes the three different types of rocks and provides a diagram showing where they fit into the rock cycle.

Instructional module focusing on the rock cycle. Discussion includes the concept of uniformitarianism and how earth materials change from one form to another. The site also includes an interactive practice quiz and links relating to the...