Water Pollution

Question 1

Residence time for water in Lake Tahoe, Nevada/California is 600 years which means that

Answer 1

A water molecule entering the lake will remain in the lake for 600 years

Question 2

When human activities alter natural chemical cycles of elements, they most often do so by

Answer 2

Increasing the rate of input of elements into the system

Question 3

A possible consequence of eutrophication is

Answer 3

Fish kills, because of the lowered dissolved oxygen in the water.

Question 4

When the source of pollutant is readily identified by one location then the type of pollution is called

Answer 4

Point Source

Question 5

Point sources of pollution include all of the following except

Answer 5

Salt runoff from roads

Question 6

Groundwater pollution

Answer 6

Is very difficult to clean up once it has occurred.

Question 7

Volumetrically, the largest non-point source of pollution in the United States is

Answer 7

Cropland

Question 8

Mercury

Answer 8

All

Question 9

Lead, mercury and plutonium are these that have a tendency to accumulate in organisms.

Answer 9

Heavy Metals

Question 10

Thermal pollution differs from most chemical pollution in that

Answer 10

It is localized in impact and short-lived.

Question 11

Improper agricultural techniques can increase erosion rates nine times higher than normal resulting in

Answer 11

Sediment Pollution

Question 12

A lake may be described as “dead” when its condition is

Answer 12

Anaerobic

Question 13

Biochemical oxygen demand is the amount of oxygen needed

Answer 13

For aerobic breakdown of organic matter in a system

Question 14

Water containing an abundance of nutrients, which encourages lush growth of such plants as algae is termed

Answer 14

Eutrophic

Question 15

Eutrophication of water is accelerated by

Answer 15

Increased sediment load from erosion.

Question 16

Groundwater pollution in situ is commonly handled by

Answer 16

Waiting for the pollutants to disperse or break down

Question 17

Dredging of a lake bottom

Answer 17

all

Question 18

The pump and treat technique is used for reversing damage done to

Answer 18

groundwater

Question 19

Which of the following statements is not true?

Answer 19

A body of water is described as “dead” when it contains fatal concentrations of toxic chemicals

Question 20

Use of microorganisms to break down toxic organic compounds in ground water is called

Answer 20

Bioremediation