Earthquakes and volcanoes pose an unpredictable and deadly threat here on Earth, but they also occur far out in the universe. What can we learn from these interplanetary phenomena that may help us predict when Mother Nature will next unleash her fury? Scientists are looking to Io, a moon of Jupiter that is jam-packed with volcanoes, for insights. Then we'll travel deep under the Earth's crust to see the physical source of these catastrophic events.
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