Why are some volcanic eruptions, like Tonga and Krakatoa, so explosive?

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In this episode I discous how magma chemistry and water work together to create the massive explosive eruptions of Tonga (January 15th, 2022) and  Krakatoa (1883).Support the show

Why are some volcanic eruptions, like Tonga and Krakatoa, so explosive?

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Why are some volcanic eruptions, like Tonga and Krakatoa, so explosive?
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