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← GeographyWhich feedback occurs when basaltic lava viscosity decreases?
A)Increased flow channelization to volcanic vents✓
B)Enhanced block formation in cooled lava
C)Pronounced pyroclastic activity increases suddenly
D)Augmented effusive eruption due viscous plugging
💡 Explanation
Increased lava temperature decreases viscosity; therefore increased molten-rock mobility enhances further flow channelization due to focused thermal erosion, rather than increased block formation, because less viscous lava spreads thin.
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