D. increase temperature gradients. The main reason that surface water pollution has largely decreased in the USA is A. a series of epidemics that inspired action. B. the discovery of new technology that makes it cheaper not to pollute. C. a decrease in withdrawn water for industrial use. D. the Clean Water Act.
Feedlots are a major cause of in water.
A. coliform bacteria B. phosphate C. nitrate D. all of these 13. Aquifers are susceptible to contamination around withdrawal wells. The most effective way to reduce water pollution is to recycle materials. C. common pollutants. D. point source polluters.