The Energy of Ocean Tides Can Be Harnessed

The moons gravitational pull on our planet is uneven. The side of Earth closest to the moon experiences the greatest pull, and the side farthest away experiences the weakest pull. The result of this uneven pull is a subtle, planetwide elongation of our oceans. As the Earth spins underneath this elongation, Earthbound observers notice a perpetual rise and fell of sea level. These are our ocean tides, and they can be harnessed for energy. 

Tidal power is normally obtained from the filling and emptying of a bay or an estuary, which may be closed in by a dam. When tidal waters flow through the dam (in either direction), they cause a paddle wheel or turbine to rotate, and this motion generates electricity. 

Of the forms of water power discussed in this section, which are solar in origin Which is lunar Which is a result of Earth s hot interior  

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