lake

When Mount Nyiragongo erupted in the Democratic Republic of Congo in January 2002 it seemed like a disaster. Molten lava plunged down the hillside and poured into nearby Lake Kivu. Many died, and much of the city of Goma was destroyed. In fact, the local people were lucky. Had the eruption spread to one of the many volcanic faults under Lake Kivu, it could have unleashed one of the most terrifying of all natural phenomena - lake overturn.

National Geographic: Naked Science - Killer Lakes: Since the death of 1,700 people near Lake Nyos in Africa, scientists have uncovered a terrifying series of hazards in lakes across the world. (www.youtube.com)

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