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← GeographyWhich outcome results when pyroclastic flows enter a drainage basin?
A)Formation of lahars occurs quickly✓
B)Soil horizons stabilize rapidly inland
C)Vegetation recovers unaffected downstream
D)River terraces become deeply incised now
💡 Explanation
Formation of lahars results because the pyroclastic flow's heat melts ice/snow or saturates loose sediment. This decreases stability via saturation, therefore flows turn into mudflows rather than stabilizing, since runoff rates rapidly rise.
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