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Match each tidal regime with its description.
List I
A. Semidiurnal
B. Diurnal
C. Mixed semidiurnal
D. Mixed diurnal
List II
1. two unequal high waters each lunar day
2. two nearly equal high waters each lunar day
3. sometimes one and sometimes two high waters
4. a single high water and low water each lunar day

  • A.A-2, B-4, C-1, D-3
  • B.A-4, B-2, C-1, D-3
  • C.A-2, B-4, C-3, D-1
  • D.A-3, B-1, C-4, D-2

Answer: A

Which regime occurs at a site depends on the relative sizes of the constituents there. The form factor, comparing the diurnal and semidiurnal amplitudes, is used to classify them. The ratio is computed from the four principal constituents.

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