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← GeographyWhich volcanic outcome increases following increased subduction rate?
A)Andesitic magma eruption volume increase✓
B)Basaltic lava flow viscosity decrease
C)Shield volcano formation frequency rises
D)Continental rift valley creation accelerates
💡 Explanation
Increased subduction delivers more water into the mantle, lowering the melting point and promoting partial melting; this leads to increased magma generation by Flux Melting. Therefore the Andesitic magma output increases, rather than basaltic properties changing or rifting acceleration.
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