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← GeographyWhich risk dramatically increases when a levee system built on alluvial deposits undergoes repeated saturation cycles?
A)Levee system structural subsidence rates✓
B)Reduced sediment nutrient bio-availability
C)Accelerated alluvial gold concentration
D)Increased frequency of dust storms
💡 Explanation
Levee saturation triggers consolidation through a process resembling squeezing, because water pressure lowers effective stress, therefore increasing system subsidence rates, rather than dust storms which stem from arid conditions, or sediment bio-availability/mineral concentration, which do not strongly rely on levees.
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