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← GeographyWhich mechanism determines the height limit of coastal dunes?
A)Erosion and sediment transport
B)Vegetation colonization equilibrium
C)Saltation and grainfall balance
D)Aeolian shear stress threshold✓
💡 Explanation
Aeolian shear stress causes a limit, because after a certain dune height, the wind stress exceeds a threshold removing material faster than deposition; therefore, a fixed height results, rather than vegetation or simple transport.
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