If you want to find a web site on a geological topic try studentadvantage.com, a guide to sites on academic topics.

Another site that is a guide to many other interesting sites is RESOURCES FOR EARTH SCIENCE AND GEOGRAPHY INSTRUCTION from Dr. Mark Francek at Central Michigan University

A web site called Earth Journeys that lets you, among other things:

Control the Earth

Check it out it will help with concepts discussed in class - such as the origin of Earth, the different Earth layers, a time line, etc.