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← GeographyWhich outcome results when pyroclastic flows entrain ambient air?
A)Increased flow runout distance✓
B)Decreased flow vent temperature
C)Elevated surface water evaporation
D)Diminished distal ash deposition
💡 Explanation
Increased runout distance occurs with air entrainment because it causes fluidization via turbulent mixing, effectively reducing friction. Therefore, the pyroclastic flow travels further, rather than being cooled or evaporating water; entrainment primarily changes flow dynamics.
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