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rift valley
rift val·ley (plural rift val·leys)


noun 
Definition:
 
valley formed by faults: a valley formed by geologic faulting, where the land between two parallel faults drops down to give a broad central plain with steep sides
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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