The Grand Question

Science  16 Sep 2005:
Vol. 309, Issue 5742, pp. 1818-1819
DOI: 10.1126/science.1116363

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Grand Canyon. Solving Earth's Grandest Puzzle. By James Lawrence Powell. Pi Press, New York, 2005. 317 pp. $27.95, C$38.95. ISBN 0-13-147989-X.

The author's account, written for the nonspecialist, centers on the efforts to understand how and when the Colorado River carved its Grand Canyon.