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Civilizations developed on the flanks of volcanoes for the same reason an estimated 500 million people continue to live on them today: mineral-rich soil, geothermal energy, tourism opportunities and natural beauty.
Following the recent volcanic eruption in Iceland, and the 30th anniversary of the eruption of Mount St. Helens, here's a list of the volcanoes which pose the biggest threat to people.
(thanks Jessie)
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