Associated Press
This July 14, 1912 photo courtesy of the U.S. Geological Survey shows barabaras (sod houses) in Douglas (now Kaguyak) village, covered with ash from the 1912 eruption of Novarupta in Alaska. A century after one of the world's largest volcanic eruptions, ash and pumice are still plentiful in Alaska's Valley of Ten Thousand Smokes. The three-day explosion that began June 6, 1912, spewed ash 100,000 feet above the state's Katmai region, covering the valley to depths up to 700 feet. (AP Photo/U.S. Geological Survey, G.C. Martin)

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