Clouds of volcanic ash and gas rise above Mount Pinatubo, Philippines, June 12, 1991, three days before the cataclysmic eruption. Credit: USGS

Clouds of volcanic ash and gas rise above Mount Pinatubo, Philippines, June 12, 1991, three days before the cataclysmic eruption. Credit: USGS

Clouds of volcanic ash and gas rise above Mount Pinatubo, Philippines, June 12, 1991, three days before the cataclysmic eruption. Credit: USGS

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