Environmental Science: A Global ConcernEnvironmental Science: A Global Concern 11th Edition by William Cunningham, Mary Ann Cunningham

تمرين 3

In figure, 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.
FIGURE
Twelve leading causes of surface-water impairment in the United States. *Undetermined causes.