Which form of energy is obtained from the difference in temperature between the water at the surface and the water at deeper levels of the ocean?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Ocean thermal energy
The water at the surface of the sea is heated by the Sun, while the water deeper down stays relatively cold. An ocean thermal energy conversion (OTEC) plant uses this temperature difference, usually 20 °C or more, to boil a volatile liquid such as ammonia; its vapour runs the turbine of a generator.