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The interval between successive spring tides is approximately

  • A.29.5 days
  • B.24.8 hours
  • C.14.8 days
  • D.7.4 days

Answer: C

Springs occur twice per synodic month of about 29.5 days, once at new moon and once at full. The half month interval is the origin of the fortnightly spring neap cycle familiar at every port. Two springs and two neaps occur in each month.

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