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← GeographyWhich pyroclastic outcome occurs when volcanic ash accumulates?
A)Lahars increase downstream debris flow✓
B)Pyroclastic surge dynamic pressure drop
C)Shield volcano basalt flooding stops
D)Fumarole sulfur precipitation sharply declines
💡 Explanation
Lahars increase downstream debris flow because significant rainfall infiltrates unconsolidated volcanic ash deposits, creating unstable slurries; therefore, the increased debris discharge is correct, rather than immediate eruptive effects from the pyroclastic flow itself.
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