Photo: Worst Volcanoes Even More Dangerous Than Feared

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A column of smoke and ash rises from Chile's Chaitén volcano on May 31, 2008.

Long-dormant volcanoes such as Chaitén can awaken in a matter of hours, spewing deadly ash plumes and fast-moving lava, an October 2009 study says.

Photograph by Alvaro Vidal/AP

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