The tides are caused by the gravitational attraction of the sun and the moon.
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What are tides ?
The periodical rise and fall of sea water once or twice a day is called tides.
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How tides are related to navigation?
Tides are related to navigation as they help the navigators and their activities. Tidal heights are very important especially for harbours near river estuaries having shallow bars of the entrance which prevent ships and boats from entering into the harbours.
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