In the design of a ________ type landfill, biodegradation and colloid adsorption are important mechanisms of reducing pollution potential.
A) natural attenuation B) containment
C) both A and B D) neither A nor B
Question 2Radionuclides from nuclear power plant accidents and weapons testing pollution get into the food chain primarily by:
A) cation exchange. B) atmospheric deposition on plant leaves.
C) uptake from soils into food plants. D) leaching to groundwater supplies.
Question 3In the United States between the 1970s and the 1990s, the level of heavy metals found in municipal sewage sludge ________.
A) decreased substantially B) stayed about the same C) increased substantially
Question 4A soils contaminated with a heavy metal may be bioremediated by:
A) burying the contaminated soil in a secure landfill.
B) growing and harvesting plants that take up large quantities of the toxic metal.
C) applying a source of carbon and nitrogen to the soil.
D) applying genetically engineered bacteria that can degrade the metal.
E) all of the above
Question 5The United States Environmental Protection Agency regulates the amount of sewage sludge that can be applied on agricultural land by setting limits on:
A) the concentrations of metals in the sludge to be applied.
B) the total accumulative amount of metals that can be applied to a parcel of land, regardless of when the metals are applied.
C) the rate of metal application to any parcel of land in any one year.
D) all of the above
E) none of the above
Question 6Which of the following are considered to be heavy metals that can contaminate soils and the food chain?
A) lead
B) copper
C) zinc
D) cadmium
E) all of the above
Question 7of contaminated soil involves the use of ________ to ameliorate the soil pollution.
A) organic solvents
B) soil microorganisms
C) photo-decomposition
D) incineration
E) binding chemicals
Question 8It has been found that continued, repeated application of an organic toxin to a particular soil will ________ the capacity of that soil's microflora to degrade the compound in question.
A) gradually enhance B) have no effect on C) gradually inhibit
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