Discussion
A barrier island is
Answer: C
Correct answer: an elongated sand island separated from the mainland by a lagoon
A barrier island is a long shore-parallel ridge of sand standing offshore with a lagoon or back-barrier marsh behind it, breached at intervals by tidal inlets. Barriers migrate landward as sea level rises, by overwash carrying sand across the crest, which is why holding one in place with defences generally destroys the lagoon behind it.
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