AnswersCentral 25-26 CR SCI 100B SpringUnit Test

Unit Test — Unit test Answers

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1
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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.
2
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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.
3

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
4

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.
5

Which environmental policy must consider the expensive startup costs associated with building machines that harvest energy from clean sources?

A
reducing air pollution
B
regulating deforestation
C
introducing new farming methods
D
protecting ocean reefs
6

Which statement provides the best argument against making major changes to the atmosphere to help protect Earth’s resources?

A
There will be less soil and dust in the air as construction increases.
B
The atmosphere will improve as more people move to large cities.
C
Making major changes to the atmosphere can be a costly process.
D
It is more important to protect land and water resources than the atmosphere.
7

Which is a negative effect of deforestation on the environment?

A
habitat restoration
B
desertification
C
soil production
D
urbanization
8

What is one way people positively affect water resources?

A
polluting from nonpoint sources
B
increasing farming and construction
C
disposing of chemicals in water
D
limiting use of acid and other pollutants
9

Which term refers to the process by which land is worn away by natural forces or human activity?

A
erosion
B
desertification
C
urbanization
D
deforestation
10

How has the EPA improved air quality over the last 30 years?

A
by monitoring pollutants and passing regulations to reduce air pollution
B
by decreasing soil erosion and dust storms
C
by building marine refuges to help protect marine life and reduce air pollution
D
by decreasing of fossil fuel use in motor vehicles and industry
11

Which statement provides the best argument in favor of deforestation?

A
Deforestation prevents erosion of farmland.
B
Deforestation prevents air and water pollution.
C
Deforestation does not affect climate around the globe.
D
Deforestation opens up land for mining and cattle ranching.
12

What is one way to make a positive impact on air quality to reduce air pollution?

A
moving to a large city
B
using public transportation
C
planting crops in terraces
D
releasing gases into the air
13

Which is a nonpoint source of pollution?

A
Tourists throw trash into the ocean.
B
A car mechanic pours oil on the ground.
C
Rain contains chemicals that seep into the ground.
D
A pipe dumps waste from a factory into a stream.
14

Which correctly lists three main causes of deforestation?

A
air pollution, mining, logging
B
mining, cattle ranching, logging
C
cattle ranching, water pollution, air pollution
D
water pollution, logging, mining
15

What process leads to deforestation and increased erosion?

A
mining
B
reforestation
C
desertification
D
urbanization
16

What human activity contributes to air pollution?

A
construction
B
reforestation
C
habitat restoration
D
dam development
17

What term refers to the practice of renewing destroyed ecosystems?

A
erosion
B
terrace farming
C
habitat restoration
D
tree belting
18

Which activity is a method of habitat restoration?

A
cleaning up after environmental disasters
B
allowing trees to grow naturally
C
farming techniques like terrace farming and tree belts
D
creating a reservoir to prevent flooding
19

Which challenge arises from trying to protect the environment?

A
high clean-energy startup costs
B
less access to clean water
C
lower taxes for citizens
D
more land available for farming
20

Which is an important question to consider when creating an environmental policy?

A
How can it reduce the need for green spaces?
B
How can it help to increase human impact on resources?
C
Is the benefit worth the cost?
D
How will it reduce tourist activity?

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