How are tides, waves and ocean currents useful for us?
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Tides help in clearing the position at the mouth of river thus preventing silting of harbours
Tides are also useful for generation of electricity but there are very few commercial sized tidal power plants operating in the world
uses of ocean currents
winds blowing over warm currents and extremely moist and cause rainfall
ocean currents also facilitate navigation ships flowing over the current are able to move faster and save time and fuel