Environmental Science 12th Edition by William Cunningham,Mary Ann Cunningham

تمرين 7

Understanding the origins of pollution is the first step toward considering policies for reducing it. The chapter you have just read includes several graphs displaying pollution data. The following questions ask you to think more about the sources of this pollution:
In figure 18.13 , which of the causes of stream or lake impairment do you think are mainly from point or nonpoint sources Most of these contaminants have multiple sources, but try to imagine the most common origin.