Grand Canyon: Solving Earth's Grandest Puzzle
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| Google books | books.google.com |
|---|---|
| Originally published | 2005 |
| Authors | James L. Powell |
| Genres | Biography |
| Date of Reg. | |
| Date of Upd. | |
| ID | 2128859 |
About Grand Canyon: Solving Earth's Grandest Puzzle
"Not only have geologists discovered the reasons for the majestic width and depth of the Canyon, they have found that at one time the Colorado River ran through it in the opposite direction. At another time, hundreds of feet of gravel buried an ancestor of today's Colorado River. . . .