Why is the moon Io volcanically active with a hot interior?
A. Io was formed later than the other Galilean satellites, so it hasn't finished cooling yet.
B. Io is very close to the Sun.
C. Io gets flexed between the changing gravitational pulls of Jupiter and Europa, heating it by friction.
D. Radioactive decay of elements in Io's core heat up the rock to molten temperatures.
Answer: C
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