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SubductionSubduction zones exist where an oceanic plate collides with a continental plate and sinks, below the latter plate, into the asthenosphere. Oceanic lithospheric plates are subducted because of their lower density. Subduction results in oceanic trenches.See also: List of Tectonic Plate Interactions -- oceanic rift -- collusion -- obduction 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Subduction".