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The water pollutant that most commonly threatens human health is


A) pathogenic organisms.
B) dissolved plant matter.
C) toxic and hazardous chemicals.
D) thermal pollution.
E) oxygen-demanding wastes.

F) C) and D)
G) B) and D)

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A(n) ________ is all the land drained by a particular river.


A) reservoir
B) water table
C) watershed
D) recharge zone
E) aquifer

F) All of the above
G) D) and E)

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________ is the water that infiltrates through the ground and is stored in spaces in soil and rock.


A) Lateral recharge
B) Rain
C) Water table
D) Surface water
E) Groundwater

F) A) and D)
G) B) and E)

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The National Pollution Discharge Elimination System (NPDES)was established as a part of the Resource Conservation and Recovery Act (RCRA).

A) True
B) False

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A TMDC measures the toxicity of a metal found in a water body.

A) True
B) False

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Withdrawal is the total amount of water


A) lost in transmission,due to evaporation or leakage.
B) taken from rivers,lakes,or aquifers.
C) used in manufacturing or agriculture.
D) altered or polluted in human activities.
E) lost due to chemical transformation because of human use.

F) A) and B)
G) A) and E)

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Domestic water conservation in the United States would save about 20% of the water we now use.Therefore,we need to come up with better technology to avoid strict restrictions in the future.

A) True
B) False

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A method of increasing water supplies that has been successful,if expensive,is


A) desalination by reverse osmosis.
B) cloud seeding.
C) towing icebergs by ship from polar regions.
D) altering the climate's convection currents.

E) A) and D)
F) B) and C)

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Best available technology (BAT) standards are standards set for


A) nonpoint pollution.
B) toxic substances.
C) radioactive waste,specifically.
D) organic compounds.

E) B) and D)
F) None of the above

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The hydrologic compartment that contains the greatest amount of fresh water is


A) groundwater.
B) the Great Lakes.
C) living organisms and biomass.
D) ice and snow.
E) clouds in the atmosphere.

F) A) and B)
G) B) and C)

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The activity that uses the greatest share of U.S.household water is


A) bathing.
B) drinking and cooking.
C) flushing the toilet.
D) washing clothes and dishes.
E) watering lawns.

F) D) and E)
G) A) and B)

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Which would not be a principal problem that has resulted from the construction of large dams?


A) evaporation and siltation
B) leakage and weakening of bedrock
C) mercury poisoning
D) the relocation of people
E) salinization of water bodies and surrounding soil

F) D) and E)
G) B) and D)

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Tertiary treatment of sewage produces water that is NOT free of


A) nutrients.
B) pathogens.
C) solids.
D) organic material.

E) None of the above
F) B) and D)

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Most water in the atmosphere has evaporated from the ocean,and ________ rain falls back into the sea.About ________ % of the earth's total rain falls on land.


A) most;10
B) most;20
C) less;55
D) less;70

E) None of the above
F) All of the above

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How much of the total water on the planet is fresh,nonfrozen,surface water?


A) 0) 02%
B) 2) 4%
C) 12.0%
D) 87.2%
E) 0) 8%

F) A) and B)
G) A) and E)

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Many cities in the American Southwest rely on sources of drinking water that contaminated with ________.


A) arsenic
B) lead
C) coliform bacteria
D) DDT

E) A) and C)
F) None of the above

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Factories,sewage treatment plants,and oil wells are ________ sources of water pollution.


A) point
B) primary
C) nonpoint
D) tertiary pollutant
E) secondary

F) C) and D)
G) A) and D)

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________ sources of water pollution are relatively easy to monitor and regulate while ________ sources of water pollution are difficult to monitor and clean up.


A) Domestic;industrial
B) Primary;tertiary pollutant
C) Nonpoint;point
D) Tertiary pollutant;primary
E) Point;nonpoint

F) B) and E)
G) A) and E)

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An oligotrophic lake would be very productive.

A) True
B) False

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The city of Arcata,California,is notable because it designed a ________ to treat its sewage.


A) system of modern outhouses
B) fully modern,technologically advanced system
C) natural marsh
D) corporate sponsorship system
E) living machine

F) B) and D)
G) B) and E)

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