Pupils clean dust covering on floor at their school after Mount Sinabung volcano spewing volcanic ash on Friday in Karo, North Sumatera, Indonesia, on April 7, 2018. (Xinhua/Alberth Damanik)
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Pupils clean dust covering on floor at their school after Mount Sinabung volcano spewing volcanic ash on Friday in Karo, North Sumatera, Indonesia, on April 7, 2018. (Xinhua/Alberth Damanik)
