Test Ch 12 Question Preview (ID: 28999)


Why are aquifers important?
a) They are found only beneath deserts, where fresh water is scarce.
b) They are sources of fresh water for much of the human population.
c) They hold more water than people could ever use.
d) They hold water much longer than most lakes on Earth.

Where does fresh water exist on Earth's surface?
a) oceans, rivers, and ponds
b) lakes, rivers, and ponds
c) lakes, rivers, and aquifers
d) oceans, rivers, and aquifers

About how much of Earth's surface is covered by water?
a) 3 percent
b) 30 percent
c) 50 percent
d) 75 percent

How do countries limit the pollution of fresh water?
a) by banning irrigation
b) by desalinating seawater
c) by building dams
d) by making laws and treaties

What condition exists during a drought?
a) a long period of higher than normal rainfall
b) a long period of lower than normal rainfall
c) a long period of lower than normal temperature
d) a long period of higher than normal temperature

What causes most pollution of fresh water?
a) untreated wastewater from city sewage systems
b) ships that spill or dump their fuel into local rivers
c) runoff carrying chemicals into water bodies
d) broken septic systems on small farms

What is the purpose of using sand, gravel, and chlorine during drinking water treatment?
a) Chlorine causes dirt and bacteria to stick together; sand and gravel remove bacteria from the water.
b) Chlorine removes dirt from the water; sand and gravel kill some of the bacteria in the water.
c) Sand and gravel cause dirt and bacteria to stick together; chlorine kills all bacteria in the water.
d) Sand and gravel filter dirt from the water; chlorine kills some of the bacteria in the water.

Which of these would be the most practical method for treating the water used at a large rural school?
a) a septic tank
b) a city sewer system
c) a desalination plant
d) a hydroelectric dam

Which of these would be the most effective way for a farmer to produce food for the global population yet still conserve water?
a) Use untreated wastewater to irrigate crops.
b) Withdraw water from nearby rivers and lakes.
c) Use drip irrigation.
d) Use spray irrigation.

Why is water so important to life on Earth?
a) It is the only substance that exists as a solid, liquid, and gas.
b) It is the only substance that cycles among Earth's spheres.
c) It is critical to industry, agriculture, and recreation.
d) It is necessary for most life functions.

Which of these is the best example of balancing water needs and conservation?
a) building swimming pools in hot climates
b) using drip irrigation systems
c) making products that use toxic materials
d) selling fresh water to places that need it

What are two possible solutions to shortages of fresh water?
a) irrigation and overuse
b) aquaculture and desalination
c) desalination and conservation
d) icebergs and irrigation

Which of these can cause water shortages anywhere on Earth?
a) drought and desalination
b) conservation and overuse
c) drought and overuse
d) desalination and overuse

Why are freshwater shortages a global problem?
a) The human population is decreasing.
b) Wastewater can't be treated quickly enough to meet demands.
c) There is less water in the water cycle today than in the past.
d) The human population is increasing.

Which of these is a good way to conserve water at home?
a) Install a septic system.
b) Drink less water than your body needs.
c) Water the grass only when the Sun is shining.
d) Run the clothes washer only when it is full.

Which of these would be used to treat the wastewater in a large city?
a) sewer system
b) septic system
c) hydroelectric dam
d) desalination plant

A pollutant is the amount of a substance that is in another substance.
a) True
b) False

What is the most important use of water in your daily life?
a) washing cars
b) irrigating the food crops that you eat
c) transporting products you use each day
d) moving nutrients through your body

Which of these could cause excess nutrients to enter a river or lake?
a) drought
b) desalination plants
c) aquaculture
d) locks

A pollutant that enters a body of water from a known source is a point-source pollutant
a) True
b) False

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