North Carolina Science Grade 6

Chapter 7: Our Impact on Land

Our Impact on Land

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