Which best explains why Miranda has the lowest tidal heating, yet has unusual surface features?

Miranda has very low tidal heating today, so ongoing tidal activity is not enough to explain its unusual terrain. Its cliffs, grooves, and other features are best explained as remnants of earlier geological activity, when conditions may have been different. It is not massive enough to generate unusually strong internal pressure, and the question does not point to constant resurfacing or retrograde motion.

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