The Calbuco volcano erupts near Puerto Varas, Chile, Thursday, April 23, 2015. The volcano erupted Wednesday for the first time in more than 42 years, billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile, and is considered one of the top three most potentially dangerous among Chile's 90 active volcanos. (Photo by David Cortes Serey/AP Photo/Agencia Uno)
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