Grand Canyon: Solving Earth's Grandest Puzzle.JAMES LAWRENCE James Lawrence (October 1, 1781 – June 4, 1813) was an American naval hero. During the War of 1812, he commanded the USS Chesapeake in a single-ship action against the HMS Shannon (commanded by Philip Broke). POWELL The Grand Canyon Grand Canyon, great gorge of the Colorado River, one of the natural wonders of the world; c.1 mi (1.6 km) deep, from 4 to 18 mi (6.4–29 km) wide, and 217 mi (349 km) long, NW Ariz. isn't just one of the seven natural wonders This article is about the television series. For other Seven Wonders, see Wonders of the World (disambiguation). Seven Natural Wonders was a television series that aired on BBC Two from 3 May to 20 June 2005. of the world. It's also a mystery and a learning resource. Early study of the canyon led directly to our current understanding of continental drift continental drift, geological theory that the relative positions of the continents on the earth's surface have changed considerably through geologic time. Though first proposed by American geologist Frank Bursley Taylor in a lecture in 1908, the first detailed theory and plate tectonics. But to this day, scientists are still arguing about exactly how the canyon formed. Up front, the book is devoted to short biographies of the early geologists who studied the canyon and details of their hypotheses for its formation. Later sections of the text get into modern theories, with geological terms well explained. Certain to appeal mostly to geology buffs, the book is understandable to other readers. Powell, executive director of the National Physical Science Consortium and a former geology professor, is author of several books on geology. Pi Press, 2005, 320 p., b&w illus., hardcover, $27.95. |
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