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The largest tidal ranges in the world reach approximately

  • A.40 metres
  • B.1 metre
  • C.16 metres
  • D.4 metres

Answer: C

Correct answer: 16 metres

The Bay of Fundy reaches a spring range of about 16 metres, and the Severn estuary and Ungava Bay are close behind. Such ranges arise where a converging, shallowing basin has a natural period close to the semidiurnal tidal period, so the tide is amplified by resonance. Most of the open ocean sees a metre or less.

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