The Subduction reference article from the English Wikipedia on 24-Apr-2004
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Subduction

Subduction 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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