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Worksheets18.1 and 18.2: Water Quality
Total questions: 10
Worksheet time: 5mins
Since the Clean Water Act of 1972, the quantities of nitrate and phosphate entering surface waters have
decreased significantly for both point and nonpoint sources.
have decreased for nonpoint sources but not point sources.
have decreased for point sources but not nonpoint sources.
essentially remained the same.
The Clean Water Act has turned out to be ___________ in achieving its point source goals.
very effective
marginally effective
ineffective
a disaster
The central goal of the U.S. Clean Water Act was to
make all surface waters swimmable and fishable.
categorize water into types of use and then establish an array of different cleanup goals.
end all water pollution in the U.S. by 2050.
eliminate all nonpoint source pollution where economically feasible.
The main reason that surface water pollution has largely decreased in the United States since 1950 is
The Clean Water Act
A series of epidemics that inspired action
The discovery of newer technology that makes it cheaper not to pollute
The decrease in water withdrawal for industrial uses
In 1998, a change in the approach to water quality was initiated by _________ with an emphasis on _________.
The EPA; cost-benefit analysis
A series of epidemics that inspired action; watershed management
Industry; cost-benefit analysis
The EPA; watershed management
Cultural eutrophication results from
Natural sediment and nutrient levels
A change in animal life as well as plants
The disappearance of tributary streams
Human activity
An oxygen sag occurs most often
In estuaries closest to a pollution source
Immediately downstream from a pollution source
Immediately upstream from a pollution source
After the water recovers from the pollution source
Toxic metals such as lead, cadmium, and mercury
Rarely threaten water supplies
Can be toxic if high concentrations are reached
Can be toxic in extremely small quantities
Are the most common health threat in water
Which of the following are inorganic toxic substances sometimes found in local water supplies?
Salts and lead
Red tides
Fecal coliform bacteria
All of these are correct
In order to avoid producing thermal plumes, power plants often
Increase the efficiency of their energy use
Warm entire rivers to ease temperature gradients
Chemically alter their effluent
Build cooling towers or ponds
