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Researchers study how marine fossils wound up in the Alps 7,000 feet above sea level while the peaks tumble down, glaciers melt and the mountains are being washed away.
Volcanoes, landslides and tsunamis are among the forces that shape the Hawaiian islands; Hawaii's volcanoes might hold clues to the inner workings of the planet.
Geology and the Colorado River have shaped the Grand Canyon, which is about a mile deep and extends for nearly 200 miles across the U.S. Southwest.
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