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← GeographyWhich outcome occurs when sediment delivery decreases to barrier islands?
A)Landward migration by overwash increases✓
B)Dune stabilization from vegetation accelerates
C)Tidal inlet formation decreases dramatically
D)Salt marsh expansion on the seaward side
💡 Explanation
Landward migration increases because diminished sediment reduces island resilience; the mechanism is overwash. Reduced sediment lessens the island's ability to withstand storm surges, therefore overwash occurs, rather than dune stabilization or salt marsh expansion which require sediment supply.
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