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What rare natural disaster occurred at Cameroon's Lake Nyos in 1986, releasing a deadly cloud of gas?

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Correct answer: Limnic eruption

Lake Nyos sits on a pocket of volcanic magma that leaks carbon dioxide into the water. In 1986, a sudden limnic eruption released a massive cloud of CO2 that suffocated over 1,700 people. Scientists have since installed specialized degassing pipes to prevent another gas buildup. Photo: United States Geological Survey, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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