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The Jovian moon Io is certainly volcanic, spewing volcanoes of sulfur into orbit!

Europa may have "ice volcanoes" caused by the cracking of the icy surface and exposing a liquid - possibly water! - in enormous plumes. This will take a lot more study to confirm. Ganymede _may_ have volcanoes; the math seems to predict them, but we haven't seen any yet. Ganymede does appear to have some sort of atmosphere, so it can't be ruled out.

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13y ago

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