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Discussion

The tide generating force arises from

  • A.the difference between gravitational and centrifugal effects on Earth
  • B.the direct gravitational pull of the moon acting on the water alone
  • C.the rotation of the Earth about its own axis without any other cause
  • D.the heating of the ocean surface by the sun during the daytime hours

Answer: A

It is the residual after the mean gravitational attraction is balanced by the orbital acceleration. This residual is what produces two bulges rather than one, on opposite sides of the Earth. Both bulges are carried round as the Earth rotates beneath them.

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