Which of the following is not classified as a surface of water?
Water pollution that arises from identifiable sources such as factories is called (?) pollution
The predominant source of nonpoint pollution is
The standard measurement of the organic nutrient concentration in a water sample is the
The degradation of organic pollutants by bacteria under the aerobic conditions uses up (?) in the water
The natural accumulation of nutrients in lakes is called
Metals, acids, and salts are (?) water pollution
Chlorine us commonly used to
(A,b,and c)
Kill bacteria in drinking water, destroy harmful organisms in wastewater treated by sewage treatment plants, and kill algae, bacteria and fungi that grows inside and clog pipes of industrial systems
The first synthetic organic pesticide was
Which of the following responses is a problem with application of pesticides?
They often kill natural pest control agents like predatory insects, the result in genetically resistant pests, they kill pollinating insects, they poison fish and other wildlife.
Some pesticides can become more concentrated as they move up the food chain, this phenomenon is called
The benefits of herbicides are
They decrease the amount of mechanical cultivation needed, they reduce weed damage, they help reduce water usage.
A drawback of herbicides is
Some weeds are resistant to some herbicides necessitating addition spraying, some weeds develop resistance, reduced cultivation due to herbicide use many encourage proliferation of pest organisms in plants/debris on the ground, herbicides may reduce a farmer's incentive to rotate crops.
Health problems from agent orange exposure may be linked to a very potent toxin that was present as a contaminant called
Agent orange was sprayed in fields in
The monitoring of pesticide residues on food in the U.S. is done by the