Question

what are the types of energy that can be obtained from the ocean

Answer 1

types of energy from ocean: thermal energyfrom the sun's heat, and mechanical energy from the tides and waves. 
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Answer 2

Tidal energy as mechanical energy and when sun's heat warms the surface water a lot more than the deep ocean water, and this temperature difference creates thermal energy is the types of energy that can be obtained from the ocean.

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