Related Overviews


More Like This

Show all results sharing these subjects:

  • Earth Sciences and Geography
  • Astronomy and Astrophysics


Show Summary Details

Quick Reference

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.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.