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← GeographyWhich risk prominently increases within active alluvial fans?
A)Avulsion severity during upstream surges✓
B)Eutrophication from decreased nutrient cycling
C)Glacial advance overriding fluvial processes
D)Permanent halocline destabilizing aquatic ecosystems
💡 Explanation
Flooding surges cause greater avulsion risk because the braided channels shift rapidly during high discharge events, exacerbating channel migration patterns; therefore, avulsion severity increases near active alluvial fans, rather than glacial activity or eutrophication affecting ecosystems.
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