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Mount Sinabung volcano spews volcanic ash in Karo, North Sumatera, Indonesia, on Dec. 18, 2017. Volcanic acitivity has become active for Mount Sinabung since its recent eruption in 2010. (Xinhua/Alberth Damanik)
Mount Sinabung volcano spews volcanic ash in Karo, North Sumatera, Indonesia, on Dec. 18, 2017. Volcanic acitivity has become active for Mount Sinabung since its recent eruption in 2010. (Xinhua/Alberth Damanik)