Read the following statement and give the correct answer
Tidal energy is harnessed by______

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Transporting seawater to a closed dam.

Purifying ocean water.

Heating ocean water.

Constructing a dam across a narrow opening to the sea.

answer is C.

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Detailed Solution

Tidal energy is produced by variations in sea levels caused by tides at various periods of the day.
Building dams is an expensive process. Therefore, the best tidal sites are those where a bay has a narrow opening, thus reducing the length of the dam which is required.
Gates and turbines are installed along the dam at specific locations.
The gates are opened when there is a sufficient variation in the elevation of the water on the different sides of the barrage.
Water flows through the turbines driving an electric generator to generate electricity.

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