Which of the following statements is true?

groundwater is not part of the water cycle.
most of the earth's water is freshwater.
refining oil pollutes the air with nitrogen dioxide.
thermal pollution is the main disadvantage of hydroelectric power.

Refining oil pollutes the air with nitrogen dioxide.

Explanation:

The refining of oil such as crude oil like petroleum producing a large amount of toxic gaseous waste in which the nitrogen dioxide is the one. The nitrogen dioxide is a chief pollutant of air. It contributes to the modification and formation of other air pollutants for example, ozone and particulate matter, it also the chief component of acid rain.

b exhibiting favoritism toward the kikuyu people.

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics