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oceanic trench
(redirected from Deep-Sea Trench)

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
oceanic trench
n
(Earth Sciences / Geological Science) a long narrow steep-sided depression in the earth's oceanic crust, usually lying above a subduction zone


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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.
 
 
 
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