oceanic trench

(redirected from Deep-Sea Trench)
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oceanic trench

n
(Geological Science) a long narrow steep-sided depression in the earth's oceanic crust, usually lying above a subduction zone

oceanic trench


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A deep, narrow trough in an ocean floor.
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By dating rock recovered from numerous seafloor locations, researchers in the early 1970s confirmed the basic cycle of plate tectonics: New ocean crust forms at mid-ocean ridges and spreads outward toward deep-sea trench subduction zones.