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fracture zone

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noun Oceanography.
  1. a long, narrow rift on the ocean floor, separating areas of differing depth: where such a zone crosses a mid-ocean ridge, it displaces the ridge by faulting.
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Origin of fracture zone

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018