Which of the following statements is true?
Hydroelectric power does not damage the environment.
Waste from nuclear power plants is dangerous to human health.
Thermal pollution decreases the temperature of aquatic ecosystems.
Oil sinks in water, which means most spills sink before harming plants and animals.

answer:

Thermal pollution is called that because it overwhelms the natural temperature control mechanisms that work in the water. The sudden temperature change poses a health risk to a wide range of aquatic and amphibious creatures.

Hydroelectric power is harmless because its water and it does not damage the enironment unless the dens get out of control.

Explanation:

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