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← GeographyWhich outcome frequently occurs when a continental plate overruns a hydrated oceanic plate?
A)Volcanic arc formation inland✓
B)Increased rate of glacial rebound
C)Formation of a large rift valley
D)Decreased frequency of offshore tsunamis
💡 Explanation
When hydrated oceanic crust subducts, dehydration reactions in the downgoing slab release water into the mantle wedge above, reducing its melting point and inducing flux melting; therefore, magma creation and subsequent volcanism results, rather than crustal deformation or reduced tsunami risk.
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