Q. What is the upward and downward movement of ocean water called?
Answer: Tide
Notes: The periodical rise and fall of the sea level, once or twice a day, mainly due to the attraction of the sun and the moon, is called a tide.
The moon’s gravitational pull to a great extent and to a lesser extent the sun’s gravitational pull, are the major causes for the occurrence of tides.

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Question Number: 49 in Oceanography - Coral Reefs, Tides and Waves in the above course in App.