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← GeographyWhich topographic outcome occurs when oceanic crust subducts?
A)Formation of a volcanic island arc✓
B)Development of a mid-ocean ridge
C)Creation of a rift valley system
D)Growth of a shield volcano plateau
💡 Explanation
The oceanic crust melts during subduction; this generates magma that rises to form volcanic island arcs via mantle upwelling, because water reduces melting temperature. Therefore, island arcs form, rather than mid-ocean ridges from seafloor spreading.
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