Thermal pollution is?
a, b or c

Question 20)  The correct answer is:  [B]:

Thermal pollution is:

 [B]:  "When water is used in industry to cool mechanisms such as a nuclear power plant; then the warmer water is released back into the ecosystem" .

(and as such; the warmer water harms the ecosystem—aquatic life forms and other life forms & disrupts the ecosystem).

Note:  By no means is this limited to a nuclear power plant.  This can be a municipal wastewater treatment plant.


Question 21) :  "The best way to deal with groundwater pollution is to avoid letting it happen to start with."  ANSWER:  "TRUE" .   {In the sense of taking steps to prevent groundwater pollution from further happening where it has not happened yet.  Note that groundwater pollution is a point source of pollution; however, pollutants have a long mean residence time (i.e. stay there for a long time and are difficult to remove safely and effectively.).}.