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Why was Tonga's volcanic eruption so powerful?

You could hear it as far away as Alaska and the West coast. It was many, many more times powerful than an atomic bomb and the largest volcanic eruption in more than 25 years.

You could hear it as far away as Alaska and the West coast. It was many, many more times powerful than an atomic bomb and the largest volcanic eruption in more than 25 years. What was so unique about the underground volcano that shook the Pacific nation last week? And what can it tell us about the climate and what's to come?

GUEST:  Shane Cronin, volcanologist at the University of Auckland

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