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Geography

Which outcome occurs when sediment accumulates unevenly offshore?

A)Barrier island formation begins
B)Tectonic plate subduction accelerates
C)Oceanic salinity becomes more stable
D)Deep sea trenches abruptly collapse

💡 Explanation

The **positive feedback** mechanism causes localized sediment increase, forming underwater topography vulnerable to wave energy dissipation, favoring longshore transport focusing deposition and supporting island nucleation because this allows formation, therefore barrier islands develop rather than other outcomes; increased salinity or trench collapse needs a specific separate mechanisms.

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