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← GeographyWhich outcome results when impermeable artificial groynes interrupt longshore drift?
A)Increased erosion downdrift of the groyne✓
B)Decreased erosion updrift of the groyne
C)Uniform sediment dispersal along coast
D)Formation of new barrier islands offshore
💡 Explanation
Increased erosion downdrift follows groyne construction because sediment supply is blocked; the groyne causes sediment accumulation updrift due to sediment accretion, therefore erosion increases down-drift, rather than a reverse pattern, or uniform distribution.
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