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← GeographyWhich outcome occurs when a rapidly eroding mountain range deposits sediment onto a flat plain?
A)Formation of an alluvial fan.✓
B)Development of a braided river.
C)Creation of an oxbow lake
D)Emergence of a karst topography
💡 Explanation
An alluvial fan forms because sediment deposition decreases stream competence, causing the water to spread out and build a conical structure. Therefore, a fan forms; rather than a delta, which forms in standing water environments.
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