Grand Canyon : Travel E-Book
Photographs by Marguerite Carstairs
http://M-carstairs.com/Travel
One of the Seven Natural Wonders of the World, the Grand Canyon has over 5 million visitors a year.
The oldest rocks at the canyon bottom are close to 2000 million years old. The Canyon itself - an erosional feature - has formed only in the past five or six million years. Geologically speaking, Grand Canyon is very young.
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