Exam 20: Water Pollution

Cold temperatures of groundwater slow down the chemical reactions that decompose wastes.

The most effective way to protect groundwater is to ____.

The leading cause of water pollution is ____________________ activities.

Which type of sewage treatment is properly matched with its process?

In cities of less-developed countries,stream pollution is largely ____.

In the U.S. ,drinking water quality is primarily regulated under the ____.

The oil company responsible for the oil spill of the Valdez was ____.

Use the figure above to answer the following question(s). -In which zone has the stream recovered,with a return of clean water organisms?

____________________ are dilute sources of pollution that are difficult and expensive to diagnose and even more difficult to control.

_______________ is any change in water quality that can harm living organisms or make the water unfit for human uses.

The Clean Water Act of 1974 requires the EPA to establish national drinking water standards,called ____________________,for any harmful pollutants.

A body of water can be depleted of its oxygen by ____.

The most common problem encountered by seabirds coated with oil is ____.

The extents of ____________________ are difficult to measure since they consist of tiny particles of plastic suspended below water.

Algal blooms created from excessive agricultural and sewage runoffs is least likely to cause _____.

About 45% of the largest water polluters in the U.S.have declared the Clean Water Act no longer applies to water they are polluting.

Groundwater dispersing a pollutant creates a(n)____________________,which,if it reaches a well,can get into drinking water.

In the sewage treatment process,the purpose of chlorination involves ____.

____________________,which produce as much waste as a small city,often dump these wastes at sea,even though it is illegal in U.S.waters.

Scientists fear the dead zone in the Gulf of Mexico could reach a tipping point beyond which the ecosystem could collapse.