Visitor rating
Contrasts "wearing down" forces, such as the action of glaciers and running water, with "building up" processes, such as the action of volcanoes.
Encyclopedia Britannica, 331 N. LaSalle St., Chicago, IL 60610, Phone: (312)347-7159, Toll-free: 800-323-1229, Fax: (312)294-2104, URL: http://www.britannica.com
Available on VHS
Running time 12 minutes.
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