An Indonesian mountain on the island of Lombok, near Bali, is suspected of unleashing one of the largest volcanic eruptions in recorded history during the mid-13th century. Scientists studying ice sheets in Greenland and Antarctica in the past 30 years found clues to a major eruption between 1257 and 1258, which sent them looking for the volcanic culprit. Researchers say Mount Samalas is the prime suspect -- within those years, it erupted and released the largest amount of sulfur of any volcano in 7,000 years.

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