Io, the innermost of the Galilean satellites of Jupiter, is one of the most geologically active bodies in the Solar System. It is dominated by volcanism and shows only minor surface modification by tectonic processes or erosion. The present photogeologic mapping was completed by compilation and synthesis of these maps and of work in progress by C.A. Wood in the Colchis Regio quadrangle and by extension into unmapped areas.
Line geometry is topologically clean.
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