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WordReference Random House Unabridged Dictionary of American English © 2024rift′ val′ley, [Geol.]- Geologygraben.
- Geologya subsea chasm extending along the crest of a mid-ocean ridge, locus of the magma upwellings that accompany seafloor spreading.
Collins Concise English Dictionary © HarperCollins Publishers:: rift valley n - a long narrow valley resulting from the subsidence of land between two parallel faults, often associated with volcanism. The East African Rift Valley is an example
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