What are the most notable surface features of Jupiter’s satellite Io?
regions with high impact crater densities?
volcanoes?
it revolves backwards around Jupiter?
smooth regions produced by flows of liquid water?
grooved ridge systems?
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I know it's highly volcanic (an effect of Jupiter's strong gravitational field churning up the core). It doesn't have any liquid water as far as I know and the volcanic activity probably removes most impact crater evidence, but I have no idea about ridge systems or revolving backwards.