Water Pollution Flashcards
Residence time for water in Lake Tahoe, Nevada/California is 600 years which means that
A water molecule entering the lake will remain in the lake for 600 years
When human activities alter natural chemical cycles of elements, they most often do so by
Increasing the rate of input of elements into the system
A possible consequence of eutrophication is
Fish kills, because of the lowered dissolved oxygen in the water.
When the source of pollutant is readily identified by one location then the type of pollution is called
Point Source
Point sources of pollution include all of the following except
Salt runoff from roads
Groundwater pollution
Is very difficult to clean up once it has occurred.
Volumetrically, the largest non-point source of pollution in the United States is
Cropland
Mercury
All
Lead, mercury and plutonium are these that have a tendency to accumulate in organisms.
Heavy Metals
Thermal pollution differs from most chemical pollution in that
It is localized in impact and short-lived.
Improper agricultural techniques can increase erosion rates nine times higher than normal resulting in
Sediment Pollution
A lake may be described as “dead” when its condition is
Anaerobic
Biochemical oxygen demand is the amount of oxygen needed
For aerobic breakdown of organic matter in a system
Water containing an abundance of nutrients, which encourages lush growth of such plants as algae is termed
Eutrophic
Eutrophication of water is accelerated by
Increased sediment load from erosion.
Groundwater pollution in situ is commonly handled by
Waiting for the pollutants to disperse or break down
Dredging of a lake bottom
all
The pump and treat technique is used for reversing damage done to
groundwater
Which of the following statements is not true?
A body of water is described as “dead” when it contains fatal concentrations of toxic chemicals
Use of microorganisms to break down toxic organic compounds in ground water is called
Bioremediation
