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← GeographyWhich outcome results when unimpeded longshore drift encounters a deeply incised river mouth?
A)Estuary widening becomes more rapid
B)Increased coastal sea stack formation
C)Riverine delta lobe progradation✓
D)Seaward barrier island migration
💡 Explanation
A riverine delta lobe will prograde because sediment transported by longshore drift fills in deeper channels when flow energy decreases with channel widening. The deposition process leads to alluvial ridge formation rather than barrier island migration or stack creation.
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