This is a comprehensive website featuring how to build a model that illustrates sea-floor spreading and subduction. It has diagrams and pictures reviewing major geological concepts.

Instructional module focusing on the development of plate tectonic theory. Discussion includes the evidence of Pangaea, and the processes of seafloor topography and seafloor spreading. Site also includes an interactive practice quiz and...

This site gives a good overview of magnetic reversals. Discusses continental drift, ocean floor magnetism, and sea-floor spreading.