Geography, 06.07.2021 21:50 Svetakotok
The leading causes of impaired, or polluted, surface waters in the United States originate from both point and nonpoint sources. Arrange the causes of pollution from most common to least common according to data from 2012.
a. pH changes
b. sedimentation
c. nitrogen and phosphorus
d. hypoxia
e. pesticides
f. pathogensp
g. mercury
h. dissolved metals (excluding mercury)
i. PCBs (industrial pollutant)
1. Most common causes
2. Least common causes
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