Io, Jupiter's innermost large moon, changes its colour due to volcanic activity and the presence of various substances on its surface.
Io has the most active volcanic body in solar system.
The tidal forces generated by Jupiter's gravitational pull, result in widespread volcanic activity.
As a result of volcanic activity and chemical composition, Io's coloir can change over time.
1. Freshly erupted sulphur deposits can appear yellow or orange.
2. Older sulphur deposits look reddish.
3. Areas with higher concentration of silicate minerals appear dark brown or black.
Thus, Io appaers to change its colour because of volcanic residues.
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