NC Freshwater Resources (8.E.1.3, 8.E.1.4)

Question 1

Industries that reduce water use, recycle water, and reuse water are practicing

Accepted Answer

conservation

Question 2

In a typical drinking-water treatment process, pumping air through the water is called ______.

Accepted Answer

aeration

Question 3

Which of the 4 major uses is predicted to change the least by 2020?

Accepted Answer

Irrigation

Question 4

What is a possible effect of high nutrient levels in water systems?

Accepted Answer

algal blooms

Question 5

Pure water is neutral, meaning it is neither an acid nor a base. Pure water has a pH of

Accepted Answer

7

Question 6

The process of obtaining fresh water from salt water is called

Accepted Answer

desalnation

Question 7

Specific sources of pollution that can be identified are called

Accepted Answer

point sources of pollution.

Question 8

Which of the following is NOT a major source of freshwater pollution?

Accepted Answer

wetlands

Question 9

GRAPH: Of the 4 major uses of water, which is will demand > 300 million gals in Hogan County.

Accepted Answer

Homes and Businesses

Question 10

Considering the food web in a pond polluted with pesticides, the highest concentration would be

Accepted Answer

found in the fish-eating birds.

Question 11

Which of the following are indicators of a healthy water source?

Accepted Answer

low temperature, high dissolved oxygen, and neutral pH.

Question 12

During drinking water treatment, unwanted particles form flocs in the process of "filtration".

Accepted Answer

coagulation

Question 13

What was the total demand by all counties for water in 1970? What is projection for 2020?

Accepted Answer

559 million kiloliters; 1, 476 million kiloliters

Question 14

The wastewater and wastes in it that are produced in homes are called "sewage".

Accepted Answer

TRUE

Question 15

A water pollutant that is caused by smoke and exhaust is

Accepted Answer

acid rain.

Question 16

Pesticides are most likely to be found in runoff from

Accepted Answer

farm fields.

Question 17

Which of the 4 major uses will increase by the most kiloliters by 2020?

Accepted Answer

homes and Businesses

Question 18

Some people have suggested towing _________ from Antarctica to supply fresh water to dry areas.

Accepted Answer

icebergs

Question 19

Using less water so that it will not be used up is called

Accepted Answer

conservation.

Question 20

GRAPH. Which of the four major uses of water demanded the least amount of water in 1970.

Accepted Answer

Electricity Generation

Question 21

A water shortage occurs when the demand for water is less than the supply.

Accepted Answer

more

Question 22

Why might chlorine be added to drinking water?

Accepted Answer

Chlorine kills disease-causing microorganisms.

Question 23

Which of these examples is a water-conservation technique that also reduces water pollution?

Accepted Answer

factories reusing water instead of returning it to river.

Question 24

Scientists found dissolved oxygen to be lowest during July/August. What is most likely cause?

Accepted Answer

high temperatures

Question 25

The 1st step in treating drinking water, called _______ involves passing water through filters.

Accepted Answer

first filtration

Question 26

The addition of any substance to water that has a negative effect on living things is called __

Accepted Answer

pollution

Question 27

A body of water that has high turbidity is

Accepted Answer

cloudy

Question 28

The pH of water is a measure of its

Accepted Answer

acidity

Question 29

A pipe spilling chemicals from a factory into a river is an example of point source pollution.

Accepted Answer

TRUE

Question 30

The first step in treating water from a river or lake is usually

Accepted Answer

filtration

Question 31

The level of two minerals--calcium and magnesium -- is referred to as ____________.

Accepted Answer

hardness

Question 32

An example of non-point source pollution is

Accepted Answer

fertilizer runoff from lawns.

Question 33

One source of water pollution is ________, which are chemicals used to kill organisms (pests)

Accepted Answer

pesticides

Question 34

The amount of one substance in a certain volume of another substance is its

Accepted Answer

concentration

Question 35

A pollutant often found in road runoff is

Accepted Answer

oil.

Question 36

Which of the following is a way to conserve water?

Accepted Answer

reusing water in a factory to cool hot machinery

Question 37

One agricultural pollutant that increases the growth of algae in a lake is

Accepted Answer

nitrates and phosphates

NC Freshwater Resources (8.E.1.3, 8.E.1.4)

Questions 37

NC Freshwater Resources (8.E.1.3, 8.E.1.4)

Questions 37