A Free Electronic Field Trip (Grades 4-9)
April 2, 2003, Noon-1:00 PM ET.

Join us in exploring the most fundamental concept
in earth science: the theory of plate tectonics.
Less than 100 years ago, most people thought that the continents were fixed and unmovable. Scientists now know that the continental crust is breaking apart, grinding together, and colliding creating earthquakes, volcanoes, and mountain ranges. Learn more about the cause of these events.

Presented in cooperation with the U.S. Geological Survey
Produced by Prince William Network / PO Box 389, Manassas, VA 20108 / 703-791-7328 / pwninfo@aol.com
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