Annenberg Foundation
Annenberg Learner: Earth and Space Science: The Engine That Drives the Earth
Material to begin an exploration of volcanoes, earthquakes, and plate tectonics. An hour-long video is accompanied by learning goals, an outline and overview, details on volcano types, plate boundaries, and "hot spots," and ideas for...
Oregon State University
Osu: Volcano World: Spreading Plate Boundaries
This page has pictures and descriptions of different areas on Earth where the plates are spreading. Also includes links to more information on slow, medium, and fast moving plates.