Other
Nevada Seismological Laboratory: Plate Tectonics, the Cause of Earthquakes
This site contains an in-depth explanation of the causes of earthquakes as they relate to plate tectonics, and also has many nice and easy to read pictures, maps, and diagrams of plate tectonics and earthquakes.
Vision Learning
Visionlearning: Plate Tectonics: The Origin of Plate Tectonic Theory
Discover Alfred Wegner's ideas relating to continental drift and seafloor spreading which are both evidence to the concept of plate tectonics.
Enchanted Learning
Enchanted Learning: All About Plate Tectonics
Simple discussion of plate tectonics and Pangaea. Includes maps and interactives.
Other
Paleomap Project
Virtual reality animation map showing continental drift from 200mya to the present. The animation map is small but effective in showing the positions of the land masses.