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Not sure about ten but number one would definitely be Krakatoa, which caused an explosion so great that the island it consisted was blown completely off the globe and could be heard 1/13th around the world. I'm pretty sure the eruption of St Helens and Pompeii would also be in the top ten, but it depends on what you define as "worst", and whether you mean human or earth's history.

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16y ago

What else can I help you with?