Which of the following statements is true? Groundwater is not part of the water cycle.

Most of the earths water is freshwater.

Thermal pollution is the main disadvantage of hydroelectric power.

Refining oil pollutes the air with nitrogen dioxide.

Im pretty sure that "Refining oil pollutes the air with nitrogen dioxide" is a true statement.

Explanation:

well,,, all the others are false because: groundwater is definitly part of the water cycle, most of earth's water is NOT fresh bc only 2% of earth's water is fresh, and hydroelectric power would contribute more to water pollution than to thermal pollution-

(I hope this was helpful)

are there any answer choices

d.

hope to be marked brainliest