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

تمرين 15

Based on what you've learned in this chapter, which of the pollutants in these two graphs (figs. 18.10 and 18.13) do you think are most likely to come from the following sources
FIGURE 18.10 Detection frequency of organic, wastewater contaminants in a recent USGS survey. Maximum concentrations in water samples are shown above the bars in micrograms per liter. Dominant substances included DEET insect repellent, caffeine, and triclosan, which comes from antibacterial soaps.

FIGURE 18.13 Twelve leading causes of surface-water impairment in the United States. *Undetermined causes.