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Exam 20: Water Pollution

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Question 31

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

A) 1 out of 100
B) 1 out of 50
C) 1 out of 20
D) 1 out of 10
E) 1 out of 7

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Question 32

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

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Question 33

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

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.

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

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

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

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

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

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

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

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.

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

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.

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

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

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

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

Which of the following statements about lakes is true?

Oxygen sag curves occur when