Rift-valley meaning

rĭft
A valley that has developed along a rift, especially one bounded by normal faults.
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A stretch of lowland lying along a portion of a rift.
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A long, narrow valley lying between two normal geologic faults. Rift valleys usually form where the Earth's lithosphere has become thin through extension associated with plate-tectonic processes. Unlike river valleys and glacial valleys that form primarily through erosional processes, rift valleys form by the subsidence of the intermediate land as the faults are pulled apart. They are on the order of thousands of kilometers long and wide.
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The deep undersea valley located along the center of the mid-ocean ridge. It is associated with the crustal thinning and extensional forces that cause magma to upwell onto the ocean floor.
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(geology) A graben structure between two tectonic plates which are opening relative to each other.
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(geology) A mid-oceanic ridge system with central valleys.
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