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← GeographyWhich process shapes alluvial fan morphology due to decreased transport capacity?
A)Sediment deposition at channel bifurcations✓
B)Uplift along regional fault zones
C)Localized glacial isostatic rebound
D)Volcanic ash sedimentation after eruption
💡 Explanation
Sediment deposition at channel bifurcations forms alluvial fans as channel slope reduces, triggering increased friction; therefore, deposition occurs, rather than continued transport, because flow competence diminishes with slope reduction; this process is termed Avulsion.
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