Editor’s Note: Jay Lehr, Ph.D., is a leading authority on groundwater hydrology and has served as executive director of the National Association of Groundwater Scientists and Engineers. Lehr is a ...
The Youngest Toba eruption was a supervolcanic eruption that occurred around 75,000 years ago at the site of present-day Lake Toba in Sumatra, Indonesia. It is one of the Earth's largest known ...
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