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American Museum of Natural History
American Museum of Natural History: O Logy: Plates on the Move
Find an interrelated set of tools--maps, animations, diagrams, photographs, and text--to help you understand tectonic plates and how they move.
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University of Delaware: Plate Tectonics
This site is a very simple overview of plate tectonics. It includes a map of all the major plates and a diagram of the layers of the earth.