Exam 22: Water Pollution

Eutrophic lakes have murky,highly productive waters in which many clear water species cannot survive.

PRIMARY AND SECONDARY SEWAGE TREATMENT -Which letter in the diagram corresponds to the point at which the water is aerated?

Near urban or agricultural areas,human activities can greatly accelerate the input of plant nutrients to a lake.This is called ___________________________________.

Which type of process is secondary sewage treatment? 

What does thermal pollution cause? 

Sewage treatment produces a gooey ____________________ that contains a slimy mixture of bacteria-laden solids,and often toxic chemicals and metals.

about 36% of sludge,also known as ____________________,is used to fertilize farmland,forests,and golf courses.

What percentage of Canada's surface freshwater is contained in the Great Lakes? 

What is the leading nonpoint source of water pollution? 

Bottled water is many times more expensive than tap water,and about 25% of it is tap water anyway.

To which category do acids,salts,and metals belong? 

ZONES -Which letter in the diagram corresponds to the zone in which the water has recovered from oxygen-demanding wastes and heat?

Which organism is NOT likely to be affected by ocean debris? 

How can farmers reduce pesticide water pollution? 

What did 100 countries agree to ban from dumping,under the London Dumping Convention of 1972? 

What will a scientist NOT likely use to determine the presence and concentration of water pollutants? 

What was one outcome of the water pollution and pollution control laws that were enacted in Canada in the 1970s? 

What is a significant source of water pollution in terms of total mass? 

Which strategy would NOT reduce cultural eutrophication? 

If the ____________________ is not monitored for contaminants or cleaned up when it is contaminated,people will be drinking water that is not good for them.