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← GeographyWhich risk increases when debris aprons overload alpine alluvial fans?
A)Increased channel avulsion frequency✓
B)Basalt hydration reduction
C)Xenolith concentration increase
D)Decreased bioturbation rates
💡 Explanation
Channel avulsion frequency increases because slope adjustments trigger new flow paths across unstable surfaces due to the decreased sediment-carrying capacity from increased debris apron density. Therefore, the answer is increased avulsion rather than reduced basalt hydration, increased concentration or bioturbation rate.
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