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← GeographyWhich outcome results from plate subduction along continental margins?
A)Andesitic volcanic arc formation✓
B)Rift valley widening
C)Extensive sandstone deposition
D)Shield volcano development
💡 Explanation
Andesitic volcanic arc formation results from flux melting. Water released during subduction lowers the mantle's melting point, which then generates magma that rises to form a volcanic arc because the hydrated minerals destabilize at depth, rather than causing rifting.
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