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A tsunami is most commonly generated by

  • A.sudden vertical displacement of the sea floor
  • B.strong winds blowing across the ocean surface
  • C.horizontal strike-slip movement under the sea
  • D.the collapse of a coastal cliff into the water

Answer: A

A shallow submarine thrust earthquake lifts or drops a large area of sea bed and displaces the whole water column above it. Strike-slip movement shifts the floor sideways and displaces far less water, which is why not every large submarine earthquake produces one.

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