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Given the nature of explosive volcanic eruptions here on Earth and the important roles of dissolved gases and plate tectonics, what might you expect of volcanoes erupting on other planets?

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Well, I would expect any planet with no plate tectonics to have little to no volcanic eruptions. If there is no mantel, then there would be no liquid rock for the planet to eject in the first place. In addition, the presence of volcanoes on a planet would suggest a mantel and...

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