Unit Test — Unit test Answers

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3

Why was it important to establish the Clean Air Act?

A
to reduce the need to study the effects of dirty air on human health
B
to determine ways to reduce the number of premature deaths per year
C
to create a regulation that makes any activities that pollute the air illegal
D
to raise the cost of air purification techniques to ensure the efficiency of removing air pollution
4

Which of the following types of sites does the National Park Service manage?

A
memorials
B
wildlife refuges
C
ecosystems
D
endangered species
5

Which statement explains how smog forms?

A
Volcanoes erupt and release ash into the sky.
B
Strong storms pick up soil and mix it with fog.
C
Sunlight and heat react with gases in the atmosphere.
D
Gases move high into the atmosphere and then fall to Earth in rain.
7

Which best explains the effect of reforestation on land?

A
It allows crops to grow in wide steps along slopes.
B
It turns land slowly into desert.
C
It turns habitable land uninhabitable.
D
It restores trees to areas where they once grew.
8

Not all countries have adopted air quality regulations as America has.What impact on human health would these countries experience if they adopt air quality regulations similar to the Americas?

A
The amount of exposure to outdoor and indoor air pollution would remain unchanged.
B
The number of premature deaths related to ultrafine particulate exposure would increase.
C
People would experience a decrease in negative health effects associated with air pollution.
D
Effects from impaired breathing would only decrease for those exposed to outdoor air pollution.
9

Which activity uses water for both recreational and industrial purposes?

A
machinery cooling
B
waterskiing
C
irrigation
D
fishing
10

Which step of desalination must be done before water is condensed and collected?

A
Water is heated until it evaporates.
B
Water is frozen, so it becomes ice.
C
Water is transported from one area to another area that has little water.
D
Water is collected and salt is allowed to settle at the bottom.
11

Examine the pictures.

Question illustration
A
coal
B
gasoline
C
oil
D
wind
12

Which solution would help local farms if the water level in a reservoir used for irrigation became low?

A
Build chinampas to raise the farmland.
B
Build wind-powered pumps to use groundwater.
C
Use shadufs to dig out the reservoir.
D
Turn farmland into paddies.
13

What farming method is used in dry or desert areas?

A
chinampas
B
drip irrigation
C
wind-powered pumps
D
aqueducts
15

Which resource is a nonrenewable resource?

A
fresh water
B
maple trees
C
solar energy
D
precious metal
16

Which federal agency helps foreign governments with international conservation efforts?

A
US Forest Service
B
US Fish and Wildlife Service
C
Bureau of Land Management
D
National Park Service
17

Which three gases are released into the atmosphere when volcanoes erupt?

A
radon, water vapor, carbon monoxide
B
radon, helium, nitrogen
C
nitrogen, water vapor, carbon dioxide
D
carbon dioxide, carbon monoxide, radon
18

Which statement describes clean air as a natural resource?

A
Clean air can always be found indoors.
B
Clean air provides nitrogen gas for plant respiration.
C
Clean air is produced when high levels of ultrafine particles circulate.
D
Clean air reduces the risk of illnesses and other health problems.
19

Why is urbanization contributing to pollution?

A
People in urban areas strip the soil of nutrients and make it difficult to grow crops.
B
People in urban areas consume more energy, food, and water.
C
People in urban areas remove minerals and metals from the ground, which increases erosion.
D
People in urban areas log forests and mine, which causes climate change.
20

How does the construction of dams positively affect natural resources?

A
by providing water for irrigation and restoring trees to areas where forests once existed
B
by creating reservoirs, preventing flooding, and renewing destroyed ecosystems
C
by preventing flooding, creating reservoirs, and providing water for irrigation
D
by renewing destroyed ecosystems and restoring trees to areas where forest once existed

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