Which chemical or chemicals appear to play a prominent role in the "volcanoes" of Io?

Name: Which chemical or chemicals appear to play a prominent role in the "volcanoes" of Io?
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Question

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Io's volcanoes primarily emit sulfur and sulfur dioxide, distinguishing its volcanic activity from the more familiar silicate-based lava found on Earth. This is due to Io's intense geological activity, driven by tidal heating from its interaction with Jupiter and other Galilean moons.

Which Chemical or Chemicals Appear to Play a Prominent Role