Peru’s Sabancaya volcano has been restless for the past few years.

Peru’s Sabancaya volcano has been restless for the past few years. Recently, the occasional puffs of ash and volcanic gases have become more frequent and intense. Since November 6, 2016, the 5967-meter (19,577-foot) mountain has produced ash eruptions and dozens of explosions. On November 16, 2016, (left) a cloud of ash billowed over Sabancaya; by November 19 (right), ash had darkened the ground. In the November 16 image, the bright area to the southwest of Sabancaya is snow near the peak of Mount Ampato, a dormant volcano. The November 16…

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