
Rupes is the Latin word for `cliff`. It is used in planetary geology to refer to escarpments on other worlds. As of January 2013, the IAU had named 62 such features in the Solar System, on Mercury (17), Venus (7), the Moon (8), Mars (23), the asteroids Vesta (2) and Lutetia (2), and Uranus`s satellites Miranda (2) and Titania (1). How rupes are......
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http://en.wikipedia.org/wiki/Rupes
[castra] Rupes was a fort in the Roman province of Dacia. ...
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http://en.wikipedia.org/wiki/Rupes_(castra)

The term applied to scarps on planetary surfaces; many scarps are thought to be the surface expression of faults within the crust of the planetary object.
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http://www.solarviews.com/eng/terms.htm
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