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Assertion (A): Historical shoreline change analyses must use a consistent shoreline definition.
Reason (R): Different definitions can differ by more than the change being measured.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the risk, and tidal state at the time of a photograph matters greatly. Correcting for it is a standard step in shoreline change analysis. Tide state can shift the wet-dry line many metres.

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