Question: Why are hydroelectric power plants not 100 % efficient? Explain your choice. a. Not all of the water is stopped, so some energy is lost.

Why are hydroelectric power plants not 100 % efficient? Explain your choice. a. Not all of the water is stopped, so some energy is lost. b. Some of the water evaporates into the atmosphere. c. Some of the water flows in different directions. d. Some of the water loses thermal energy

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