From the German Rille.
- A long, narrow depression in that resembles a channel, found on the surface of various lunar and planetary bodies.
Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the lunar surface that resemble channels. (It is pronounced the same as a secondary name for a river in Normandy in France. See Risle.) Typically a rille can be up to several kilometers wide and hundreds of kilometers in length. However, the term has also been used loosely to describe similar structures on a number of planets in the solar system, including Mars, Venus, and on a number of moons. All bear remarkable structural resemblance to each other.
StructuresThree types of rille are found on the lunar surface:
FormationPrecise formation mechanisms of rilles have yet to be determined. It is likely that different types formed by different processes. Common features shared by lunar rilles and similar structures on other bodies suggest that common causative mechanisms operate widely in the solar system. Leading theories include lava channels, collapsed lava tubes, near-surface dike intrusion, subsidence of lava-covered basin and crater floors, and tectonic extension.
- Ewen A. Whitaker, Mapping and Naming the Moon, Cambridge University Press, 1999, ISBN 0-521-62248-4.
rille in Italian: Rima (esogeologia)
rille in Dutch: Rille