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← GeographyWhich outcome occurs when rising magma experiences crustal contamination?
A)Increased viscosity of lava flow✓
B)More frequent effusive eruptions
C)Decreasing silica concentrations formed
D)Reduced pyroclastic material production
💡 Explanation
Crustal contamination increases silica content, elevating magma viscosity because fractional crystallization occurs as the magma cools. Therefore, more viscous lava results, rather than effusive flows that are less viscous due to low silica and gas contents.
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