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A ria is

  • A.a broadly triangular deposit built out at a river mouth
  • B.a drowned river valley formed by relative sea level rise
  • C.a glacial trough drowned by the sea
  • D.a bar built across the mouth of a bay

Answer: B

Rising sea level flooded the valley, producing a branching inlet that deepens seaward. A fjord differs in being glacially over-deepened with a shallow sill at its mouth. Both are inherited from a lower sea level stand.

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