Question 1

Oxygen sag curves occur when ____.

Accepted Answer

A)   water levels are high
B)   bacteria break down biodegradable wastes
C)   when water flows quickly
D)   when water is cool or cold
E)   salt and fresh water mix

Question 2

A good indicator of water quality is the number of ____.

Accepted Answer

A)   ducks
B)   fish
C)   turtles
D)   coliform bacteria
E)   protozoa

Question 3

What percentage of the people using coastal beaches in the United States developed ear infections,sore throats,eye irritations,respiratory disease,or gastrointestinal disease from swimming in seawater contaminated by infectious viruses and bacteria?

Accepted Answer

A)   5%
B)   10%
C)   20%
D)   40%
E)   80%

Question 4

Agricultural activities are by far the leading cause of water pollution.

Accepted Answer

A) True 
 B)False

Question 5

The individual matters in terms of what can be done to help reduce water pollution.Pollution will not,however,be reduced if we ____.

Accepted Answer

A)   fertilize gardens and lawns with manure or compost instead of fertilizers
B)   minimize use of pesticides
C)   prevent yard wastes from entering storm drains
D)   do not flush unwanted medicines down the toilet
E)   buy commercially produced foods

Question 6

The primary drawback of waterless,odorless composting toilet systems is that they ____.

Accepted Answer

A)   convert human fecal material to soil-like fertilizer supplement
B)   become clogged very easily
C)   save large amounts of water
D)   are not feasible for large-scale projects
E)   involve expensive upfront installation costs

Question 7

What percentage of the world's population lives on or near the coast?

Accepted Answer

A)   20%
B)   30%
C)   40%
D)   50%
E)   60%

Question 8

Arsenic in the drinking water is not a concern in the United States.

Accepted Answer

A) True 
 B)False

Question 9

Oxygen depleted zones form around the world,occurring mostly in ____________________ waters and in landlocked seas.

Accepted Answer

The answer of Oxygen depleted zones form around the world,occurring...

Question 10

Which statement about the Gulf of Mexico's "Dead Zone" is false?

Accepted Answer

A)   The dead zone dissipates in fall with the arrival of storms and cooler weather.
B)   The Gulf of Mexico is stratified,with warmer,oxygen-rich water on top and cooler,low-oxygen water on bottom.
C)   Most oxygen in the bottom layer is consumed by bacteria decomposing algae.
D)   Engineering and wetland degradation contribute to dead zone formation.
E)   Negative effects from the dead zone are short-term and confined to the immediate area.

Question 11

Explain how algae blooms form and how they contribute to the creation of dead zones.

Accepted Answer

An abundance of sunlight and excess nutr...

Question 12

In most developed countries,large fish kills and contamination of drinking water are not caused by ____.

Accepted Answer

A)   malfunctioning sewage treatment plants
B)   accidental release of toxic industrial chemicals
C)   deliberate release of toxic industrial chemicals
D)   accidental release of predatory exotic species
E)   pesticides and plant nutrients from agricultural sources

Question 13

The Great Lakes are sensitive to pollution because less than 1% of the water that enters the lakes leaves via the ____ River.

Accepted Answer

A)   Mississippi
B)   Missouri
C)   Cuyahoga
D)   St.Lawrence
E)   Erie

Question 14

What is an ineffective method of purifying water for drinking?

Accepted Answer

A)   protecting watersheds from pollution
B)   exposing water in a clear plastic bottle to intense sunlight
C)   LifeStraws
D)   PUR
E)   centrifugation

Question 15

Dead zones have a detrimental impact on ____.

Accepted Answer

A)   fish and shellfish populations
B)   agricultural farms
C)   ethanol fuel production
D)   sewage treatment
E)   phytoplankton

Question 16

Natural and anthropogenic sources of ____ contaminated groundwater are a global problem that results in hundreds of thousands of premature deaths.

Accepted Answer

A)   arsenic
B)   cadmium
C)   lead
D)   magnesium
E)   manganese

Question 17

Drinking water for about ____ of the U.S.population and ____ of the rural populations comes from groundwater.

Accepted Answer

A)   50%;50%
B)   50%;95%
C)   10%;50%
D)   10%;95%
E)   75%;75%

Question 18

Eutrophication can be reversed if nutrient inputs are sharply reduced,but it takes a relatively long time to reverse the damage.

Accepted Answer

A) True 
 B)False

Question 19

In parts of the U.S.thousands of new well are being drilled to extract natural gas via the process of ____________________,which scientists fear may threaten groundwater.

Accepted Answer

hydraulic ...

Question 20

One-fifth of all the freshwater in the world is contained in the ____________________ of the United States.

Accepted Answer

The answer of One-fifth of all the freshwater in the...

Exam 20: Water Pollution

Oxygen sag curves occur when ____.

Correct AnswerverifiedShow Answer

Which statement about the Gulf of Mexico's "Dead Zone" is false?

Correct AnswerverifiedShow Answer

The Great Lakes are sensitive to pollution because less than 1% of the water that enters the lakes leaves via the ____ River.

Correct AnswerverifiedShow Answer

Eutrophication can be reversed if nutrient inputs are sharply reduced,but it takes a relatively long time to reverse the damage.

Correct AnswerverifiedShow Answer

The individual matters in terms of what can be done to help reduce water pollution.Pollution will not,however,be reduced if we ____.

Correct AnswerverifiedShow Answer

One-fifth of all the freshwater in the world is contained in the ____________________ of the United States.

Correct AnswerverifiedShow Answer

Dead zones have a detrimental impact on ____.

Correct AnswerverifiedShow Answer

In parts of the U.S.thousands of new well are being drilled to extract natural gas via the process of ____________________,which scientists fear may threaten groundwater.

Correct Answerverifiedhydraulic ...View AnswerShow Answer

Arsenic in the drinking water is not a concern in the United States.

Correct AnswerverifiedShow Answer

What percentage of the people using coastal beaches in the United States developed ear infections,sore throats,eye irritations,respiratory disease,or gastrointestinal disease from swimming in seawater contaminated by infectious viruses and bacteria?

Correct AnswerverifiedShow Answer

A good indicator of water quality is the number of ____.

Correct AnswerverifiedShow Answer

The primary drawback of waterless,odorless composting toilet systems is that they ____.

Correct AnswerverifiedShow Answer

Explain how algae blooms form and how they contribute to the creation of dead zones.

Correct AnswerverifiedAn abundance of sunlight and excess nutr...View AnswerShow Answer

What percentage of the world's population lives on or near the coast?

Correct AnswerverifiedShow Answer

Natural and anthropogenic sources of ____ contaminated groundwater are a global problem that results in hundreds of thousands of premature deaths.

Correct AnswerverifiedShow Answer

Oxygen depleted zones form around the world,occurring mostly in ____________________ waters and in landlocked seas.

Correct AnswerverifiedShow Answer

In most developed countries,large fish kills and contamination of drinking water are not caused by ____.

Correct AnswerverifiedShow Answer

Agricultural activities are by far the leading cause of water pollution.

Correct AnswerverifiedShow Answer

What is an ineffective method of purifying water for drinking?

Correct AnswerverifiedShow Answer

Drinking water for about ____ of the U.S.population and ____ of the rural populations comes from groundwater.

Correct AnswerverifiedShow Answer

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hydraulic ...
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An abundance of sunlight and excess nutr...
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Drinking water for about of the U.S.population and of the rural populations comes from groundwater.

Correct Answer
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