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Understanding Geologic Time
This site "introduces students [in grades 5 through 10] to geologic time, the evidence for events in Earth's history, relative and absolute dating techniques, and the significance of the geologic time scale." Includes interactive quizzes, and lesson plans for teachers. From the Museum of Paleontology, University of California, Berkeley.
http://www.ucmp.berkeley.edu/education/explorations/tours/geotime/

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