Chapter 10 Mcgraw Hill Environmental Science

On a global scale, improving ____ would provide the largest reduction in freshwater loss.

• systems of dams and reservoirs

• water transfer methods

• wastewater treatment methods

• irrigation practices

____________________ involves removing dissolved salts from seawater or brackish water to increase supplies of fresh water.

• Desalination

• wetland

• lake

• river

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The majority of oil pollution in oceans comes from _____.

• tanker accidents

• fuel dumped from cruise ships

• normal operation of offshore wells

• runoff from land

Cultural eutrophication is more likely to degrade ____________________ than fast-moving streams and rivers.

• organic

• lake

• virtual

• drip

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Government ____________________ keep the price of water low, which promotes water waste.

• lakes

• ground water

• subsidies

• organic

What causes dead zones?

• plant nutrients and fertilizer runoff from land

• infectious agents from human and animal wastes

• oil spilled by tankers at sea

• inorganic chemicals from industry, farms, and households

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The cold temperatures of ____________________ slow down chemical reactions that decompose wastes.

• Ground water

• lakes

• drip

• dead zones

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What is gray water?

• water that passes through a desalination plant

• virtual water that is used indirectly by consumers

• untreated sewage from industrial sources

• used water from household appliances

Which statement about Earth’s supply of fresh water is correct?

• About 70% of Earth’s fresh water is available for human use.

• Most of Earth’s annual surface runoff is available for human use.

• Earth’s freshwater supply is not distributed evenly

• Earth’s freshwater supplies are not recycled.

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Pollution from runoff can be prevented by ____________________ farming techniques that don’t use synthetic inorganic fertilizers and pesticides.

• subsidies

• organic

• rivers

• aquifer

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