BY LETTER
Rift Valley
Long straight deep valley produced by the separation of crustal plates. Rift valleys only occur where there are active or incipient plate tectonic stresses, most usually on the surface of Gaian Type planets. However rift-like features can also be seen in the ice of Europan Type worlds.
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Development Notes
Text by M. Alan Kazlev
Initially published on 22 December 2001.
Initially published on 22 December 2001.
