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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Alka Tripathy-Lang, PhD

Alka Tripathy-Lang is a freelance science writer based in Chandler, Arizona, and holds a Ph.D. in geoscience.
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