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A Very Big Bang

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Science  04 Nov 2011:
Vol. 334, Issue 6056, pp. 586
DOI: 10.1126/science.334.6056.586

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The millennium eruption of Changbai, a volcano that straddles the border between North Korea and China, was one of the biggest in recorded history and is an enduring riddle. Piecing together what happened 1000 years ago could help scientists gauge the volcano's modern-day risk. One major uncertainty is how much material, or tephra, was ejected during the eruption.