Unformatted text preview: . The Grand Canyon in Colorado was carved by the Colorado River. It is about 300 miles long and up to 20 miles wide in certain parts. The Grand Canyon attains a depth of over 1 mile. The greatest geologic importance of the Grand Canyon lies in the millions of years of history its walls display. As the Colorado River cut through the prehistoric rock, it revealed a cross section that tells us a great deal about the history of the Grand Canyon and what type of materials the Grand Canyon is made of. Geologists have found many fossil samples that help date the formation of the Grand Canyon back to some 17 million years ago. Textbook: Page 547 Physical Geography: A Landscape Appreciation, by Tom McKnight and Darrel Hess, 9 th Edition....
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This note was uploaded on 10/22/2011 for the course PSYC 311 taught by Professor Mayhew during the Fall '11 term at Rutgers.
- Fall '11