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Subduction is a geological term describing the process of two tectonic plates being driven together, one diving under and the other riding over top of the other. The subduction zone is generally localized on one small section of the two plates where the extreme pressures sometimes move in explosive seconds. Subduction
 
When oceanic crust ages it increases in density, being heavier and more dense than the continental crust the oceanic crust dives under the lighter, lower density continental crust. The oceanic crust curves down into the earth's mantle.
 
A common result of a subduction is an earthquake with a subsequent tsnami.
Subduction of Tectonic Plates
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