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Why do volcanoes erupt?

Why do volcanoes erupt?

Update: 2019-04-23
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Volcanoes are one of the most powerful forces on Earth. This week we go right up close with volcanologist Heather Handley and peek inside a volcano to see how they work. Turns out here’s a lot going on underground!
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Why do volcanoes erupt?

Why do volcanoes erupt?