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What causes Subduction at deep-ocean trenches?

April 26, 2017causes deep-ocean subduction trenches

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What causes Subduction at deep-ocean trenches?

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Subduction is a result of a collision between two tectonic plates, either oceanic to oceanic collision or oceanic to continental plate collision. The heavier, or more dense plate sinks under the more buoyant less dense plate, and is drawn down into the upper mantle.