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rille


Hadley Rille
Hadley Rille on the southeast edge of Mare Imbrium
A long, narrow furrow, usually with steep sides and sometimes meandering (known as a sinuous rille), formed either as an open channel in a lava flow, or as an underground tube carrying hot lava that collapsed as the lava flowed out. Rilles up to several hundred kilometers long and 1 to 2 km wide are common on the Moon and on the surface of several other moons and planets in the solar system.


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   • GEOLOGY AND PLANETARY SCIENCE


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