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← GeographyWhich delta characteristic increases when progradation temporarily exceeds subsidence?
A)Increased alluvial plain surface area✓
B)Decreased faulting across the delta
C)Higher organic sediment decomposition rate
D)Reduced channel avulsion frequency rate
💡 Explanation
Increased alluvial plain area results, because deposition overtakes sinking; isostatic adjustment dictates relative elevations. Deposition drives progradation; therefore, surface area increases rather than faulting, decay, or channel changes which reflect varied controlling processes.
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