Unit Test — Unit test Answers

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41
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Which of the following might occur if people fail to conserve water?

A
increased sewage system failures
B
increased numbers of natural pollution filters
C
increased water supply
D
increased wildlife habitats
42
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Why has groundwater use increased?

A
the total amount of freshwater has decreased
B
more of the available freshwater is stored in glaciers and icecaps
C
governments have banned the use of freshwater in rivers and springs
D
the demand for freshwater has increased due to population growth
43

Lakes and rivers constitute _______.

A
87% of freshwater
B
a tiny fraction of Earth’s freshwater
C
a majority of Earth’s freshwater
D
a majority of water on earth
44

Nonpoint source pollution is difficult to control because it _______.

A
comes from a direct point of origin
B
comes from a variety of sources
C
remains the same over time
D
none of the above
45

Using a broom to clean sidewalks and driveways is a way to reduce water pollution.

A
T
B
F
46

The principle difference between point source and nonpoint source water pollution is _______.

A
whether the pollution is organic or inorganic
B
the number of sources of pollution
C
the amount of pollution
D
whether it is from commercial or agricultural sources
47

The EPA regulates the dumping of _______ in oceans as outlined by the Ocean Dumping Act.

A
industrial waste
B
sewage sludge
C
medical waste
D
all of the above
48

Which of the following factors does not influence the level of the water table?

A
pumping
B
time of year
C
pollution
D
none of the above
49

What is a possible long-term consequence of groundwater overdraft?

A
increased vegetation
B
unproductive wells
C
polluted groundwater
D
higher water tables
50

Why is water conservation important?

A
It is important in desert areas because water is scarce, but not in areas with high levels of precipitation.
B
Water conservation is important because people are currently consuming freshwater resources faster than they can be replenished.
C
Water conservation is important because only 10% of Earth’s water sources are usable.
D
All of the above are true.
51

What happens if the use of groundwater exceeds the rate of replenishment?

A
the depth of the water table increases
B
the water table is more likely to be polluted
C
the depth of the water table decreases
D
the water table remains unchanged
53

The location of the water table is subject to change.

A
T
B
F
54

Algal blooms, and the rapid proliferation of photosynthetic plankton can ultimately end up depleting all the oxygen from a body of water.

A
T
B
F
56

The defining characteristic of potable water is that it _______.

A
is used as tap water
B
can be used for washing and irrigation
C
can be used and consumed without risk
D
is delivered through pipes
57

Which of the following is a program rather than a law regulating water quality?

A
The Safe Drinking Water Act
B
The Clean Water Act
C
WaterSense
D
The Marine Protection, Research, and Sanctuaries Act
58

Which of the following is a consequence of water polluted by human sewage?

A
pathogens
B
disease vectors
C
high levels of contaminants
D
all of the above
59

Conserving water can save money while protecting the environment.

A
T
B
F
60

How does groundwater become polluted?

A
Pollutants mixed with water pass through permeable layers above the aquifer.
B
Factories dump their waste directly into aquifers.
C
Refuse infiltrates the water table when garbage is dumped.
D
All of the above

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