Answer:
The
energy can be harnessed from ocean in following ways
(i) Tidal Energy Due to the
gravitational pull mainly of the moon on the spinning earth, the level of water
in the sea rises and falls, is called high and low tides can be harnessed by constructing
a dam across a narrow opening to the sea. (1)
(ii) Ocean Thermal Energy The water at the surface of the sea or ocean is
heated by the sun while the water in deeper sections is relatively cold.
This difference in temperature is exploited to obtain
energy in ocean thermal energy conversion plants. 
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