Indiana Science Grade 8

Chapter 20: Our Impact on Land

Our Impact on Land

1.
Why is Earth experiencing a population explosion?
A)because the number of people on Earth is increasing rapidly
B)because the population has always been increasing rapidly
C)because some people think Earth's population is too small
D)because the population is maintaining a steady, but slow, increase.
2.
Why is preserving national forestlands, grasslands, and parks important?
A)It will keep land safe so it can be used later.
B)because eventually humans will need more forests for lumber
C)because humans can use it to store wastes
D)It will benefit future generations.
3.
Which of the following most positively impacts Earth's land and natural resources?
A)using mass transit
B)destruction of rain forests
C)farming
D)feeding livestock
4.
Which of the following human practices does NOT aid in protecting the environment?
A)retire
B)reduce
C)recycle
D)reuse
5.
The _____________ is the largest number of individuals of a particular species that the environment will support.
A)population
B)holding point
C)carrying capacity
D)society
6.
An example of a fossil fuel is__________.
A)wind
B)hydropower
C)oil
D)nuclear
7.
Why can't plants used in phytoremediation be used to feed livestock?
A)It tastes bad and livestock won't eat it.
B)It costs too much.
C)Livestock often is used to feed humans.
D)The plants die too quickly.
8.
What prevents soil from being carried away through erosion?
A)rocks
B)walls
C)plant roots
D)cement
9.
Earth has a limited amount of space and resources. You could say that Earth is somewhat like __________.
A)a continent
B)an island
C)a mountain
D)a peninsula
10.
If an environment exceeds its carrying capacity, what will happen to its resources?
A)They will run out.
B)They will increase.
C)They will be unaffected.
D)They will stay the same.
11.
A changing water cycle in tropical areas might be a result of ___________.
A)overflowing garbage dumps
B)conservation efforts
C)use of alternative energy resources
D)cutting down tropical rain forests
12.
One way to prevent liquid wastes from sanitary landfills from draining into the ground water is by __________.
A)emptying them out regularly
B)lining the landfills
C)spraying them down
D)allowing only certain items to be dumped
13.
What process produces pollutants?
A)refining oil
B)harnessing hydropower
C)collecting wind
D)carpooling
14.
What is one thing a company could do to help lessen the impact today's throwaway culture has on the environment?
A)reduce packaging
B)lower costs
C)increase production
D)build more plants
15.
Which of the following is NOT an effect of paving streets?
A)increased rainfall
B)reduced ground water supplies
C)increased stream discharge
D)increased runoff
16.
A population is all of the individuals of one __________ occupying the same ___________.
A)group, area
B)species, space
C)group, space
D)species, area
17.
What kinds of items often are found in a compost pile?
A)leaves
B)plastic
C)paper
D)metal
18.
Which of the following is NOT caused by depletion of Earth's forests?
A)increased temperatures on Earth
B)increased levels of carbon dioxide
C)extinction of species
D)increasing rainfall
19.
How does a plant's enzymes help in the reduction of organic pollutants?
A)They can make the pollutants disappear.
B)They can speed the rate at which the pollutants break down.
C)They can maintain the rate at which the pollutants break down.
D)They can slow down the rate at which the pollutants break down.
20.
Which of the following has NOT contributed to the increase in Earth's human population?
A)better medicine
B)creating landfills
C)clean water
D)better nutrition
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