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Geography

Which secondary effect consistently results when a deep-sea trench forms at a subduction zone?

A)Decreased salinity of surface waters
B)Extensive coastal plain development
C)Formation of an accretionary wedge
D)Increased thermocline mixing

💡 Explanation

When an oceanic plate subducts creating a trench, sediment and crustal material are scraped off the descending plate by the overriding plate forming an accretionary wedge because the subducting plate drags them along Therefore, accretionary wedge formation occurs rather than the other alternatives which depend on different processes.

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