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← GeographyWhich consequence results when rainfall saturates unconsolidated pyroclastic deposits on steep volcanic slopes?
A)Debris flow initiates downslope rapidly✓
B)Lava flow viscosity increases sharply
C)Shield volcano inflation accelerates upward
D)Caldera collapse abruptly is triggered
💡 Explanation
Rainfall saturating pyroclastic material increases pore pressure, reducing shear strength; therefore, debris flow occur rapidly down slope via **liquefaction**, rather than increased magma viscosity or caldera events because those don't depend on precipitation.
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