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Exam 20: Water Pollution

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Question 31

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The natural nutrient enrichment of a shallow lake, estuary, or slow moving stream is called

A) oligotrophy
B) spring/fall overturn
C) upwellings
D) red tides
E) eutrophication

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Question 32

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

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Question 33

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The invasion by zebra mussels into The Great Lakes is an example of pollution.

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

In less-developed countries cities discharge_______________ of their untreated sewage directly into rivers, streams and lakes whose waters are used for drinking, bathing, and washing clothes.

The individual matters in terms of what can be done to help reduce water pollution.All of the following are things we can do, except

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

Which of the following types of sewage treatment are properly matched?

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

The World Health Organization (WHO) estimates how many people on earth do not have access to clean drinking water?

Over the 21ˢᵗ century, scientists expect to find many millions of ____ to become a major global health problem.

Which of the following statements about lakes is true?

As a result of efforts of researchers and the public, the waste water formerly released into Lake Washington was diverted into nearby rivers.

An important indicator of water quality is the level of ____________________, which changes due to the oxygen demand of breaking down biodegradable wastes.

One of the primary lessons that can be learned from the Core Case Study about Lake Washington is that citizen pressure on elected officials works.

Oxygen sag curves occur when

Water is being bottled and shipped to the U.S.and Europe from the Pacific island of Fiji, yet _____ of the people of Fiji do not have access to safe drinking water.

At least __________ % of the oil reaching the oceans is spilled, leaked, or dumped onto land on into sewers.

Human activities can greatly accelerate ____________________ by increasing the rate at which nutrients and organic substances enter aquatic ecosystems from surrounding land.

Developing countries dump the majority of their untreated sewage directly into freshwater ecosystems.