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rille


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A well-defined, long, narrow valley on the Moon with steep walls and roughly parallel sides. There are three main types: straight (or linear) rilles which appear to be graben, where the surface has dropped between two parallel faults; arcuate rilles, which are similar but curved in plan view, and often concentric with a circular mare basin; and sinuous rilles, which are different in origin. See also rima.

Subjects: Earth Sciences and Geography — Astronomy and Astrophysics.


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