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Geography

Which outcome results from crustal flow obstruction during subduction?

A)Formation of an accretionary wedge
B)Increased mantle plume upwelling
C)Decreased volcanic arc activity
D)Enhanced fault creep deformation

💡 Explanation

An accretionary wedge forms due to sediment and crustal material scraping off the subducting plate and accumulating, because crustal flow is obstructed; this creates a build-up of material scraped from the subducting plate, therefore forming an accretionary wedge rather than other outcomes associated with mantle dynamics.

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