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Which lake, shared between the DR Congo and Rwanda, is famous for containing massive amounts of dissolved methane gas?

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Correct answer: Lake Kivu

Lake Kivu is one of Africa's Great Lakes and contains huge reserves of methane and carbon dioxide deep under its surface. This poses a rare risk of a limnic eruption, but it is also being harnessed to generate clean electricity for the region. Photo: NASA, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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