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← GeographyWhich erosional effect results from prolonged lahar flows?
A)Downcutting a deep, steep-walled channel✓
B)Formation of a V-shaped river valley
C)Creation of a meandering floodplain
D)Development of stacked alluvial terraces
💡 Explanation
Lahars, mixtures of volcanic ash and water, transport significant sediment; therefore, they cause downcutting because this process results in the "abrasion" mechanical weathering and deepened channels, rather than lateral erosion or floodplain development.
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