The site, presented by About.com, categorizes and lists a plethora of different rocks. They have divided them by their rock structure: igneous, sedimentary, and metamorphic. Under each category are a list of different...

How much do you know about rocks? Well, if you are a bit unsure about distinguishing an igneous rock from a sedimentary rock you'll certainly be on solid ground after taking a tour through this feature created by...

If you are having difficulty remembering the details of the Earth's geological structure or the nature of major minerals and rock types, you can consult this excellent introductory course offered as part of MIT's...

This interactive lesson on metamorphic rocks starts with a review of the rock cycle and goes on to describe the relationship between metamorphic rocks and their parent rock. The lesson then describes the agents of...

This site features Flash animations that illustrate various facets of the rock cycle. The visualizations depict rock-forming processes, such as erosion, transportation, deposition, cementation, crystallization,...