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Which of Jupiter's moons is the most volcanically active body in the solar system?

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Correct answer: Io

Io is an incredibly dynamic moon, constantly reshaped by hundreds of active volcanoes erupting with sulfur and silicate rock. This intense volcanic activity is driven by immense tidal forces exerted by Jupiter and the other Galilean moons, which powerfully stretch and squeeze Io's interior, generating extreme heat. Photo: NASA, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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