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← GeographyWhich geomorphological feature develops when reduced stream gradient promotes vertical alluvial deposition along a floodplain?
A)Entrenched meanders within bedrock valleys
B)Braided stream patterns with sediment bars
C)Incision of terraces along the valley walls
D)Formation of natural levees along channel banks✓
💡 Explanation
When the stream gradient reduces, decreased competence causes vertical alluvial deposition because sediment load can no longer be efficiently transported, leading to buildup of natural levees alongside the channel. Therefore natural levees develop, rather than entrenched meanders, braided streams, or terrace incision which require different hydraulic and erosional conditions.
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