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Geography

Which feedback maintains braid formation distal to alluvial megafans?

A)Aggradation exceeding channel incision rates
B)Decreased slope increases flow velocity
C)Vegetation stabilizing primary channel banks
D)Cohesive soil preventing lateral migration

💡 Explanation

Aggradation causes further channel divergence via avulsion: decreased slope follows aggradation, and this positive feedback loop increases braid channel formation, rather than channel stabilization from vegetation because channel instability dominates.

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