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The moon's role in causing tides is much more high and important than that the sun me reason is mat the moon enjoys more proximity to the earth than the sun as such its force of attraction is stronger than that of the sun in attracting the surface water. Tides are of immense importance. In trade, navigation and fishing, tides are very useful. During the high tide, the water depth near the coast goes up and helps big ships to reach the ports. Kandia port in Gujarat and Diamond Harbour in West Bengal owe theirvery existence to the tides only. The significance of both London and Kolkata also depends on the tides.

Tides also keep the harbours clear of refuse and mud brought down by rivers and thus they do not allow the harbours to be silted. Commonly, the tidal rivers are navigable. For the purpose of generating electricity, tidal waves are harnessed. Tides do not allow the sea water to be frozen by keeping the sea water in motion. Tides are also made use by the fishermen for sailing into the sea and returning to the harbour. In the countries like Canada, U.K., France and Japan, tidal power stations are set up.

How are tides useful for the economy of the country?

A) Tides bring treasure of sea with them.

B) During high tides, big ships can reach the ports thus opening new vistas for business.  

C) Tides destroy enemies of the country.

D) None of the above.