Multiple choice general knowledge

Which of the following is the best definition of ‘Tides'

  1. A powerful movement of the ocean which proceed constantly in a definite direction

  2. A great circulatory movement of sea water caused by difference in density of sea water.

  3. A periodic rise and fall of sea water caused by the gravitational force of moon and sun on earth

  4. A wind and pressure system having a low pressure in center and circular wind motion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tides are the periodic rise and fall of sea water levels caused primarily by the gravitational pull of the moon and secondarily by the sun. Option A describes ocean currents, B describes thermohaline circulation, and D describes cyclonic systems - none of which are tides.

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