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.
Scouring Iceland, the world's largest volcanic island, for clues about the powerful forces that are ripping the landscape apart and lighting its volcanoes.
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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