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The deadliest volcanoes are the so-called "supervolcanoes", which can cover an entire continent in volcanic ashes. They erupt perhaps once every 100,000 years on average. They are all over the world; for example, there is one in Yellowstone Park. For a list of additional known supervolcanoes, read the Wikipedia article on "Supervolcano". Or some other online source.

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11y ago

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