UNIT C
Review and Test Prep
Write the letter of the best answer choice.
1. Which covers most of Earth's surface?
---see pictures
2. Which natural resource helps plants grow?
A. humus
B. fossil fuels
C. metal ores
D. geothermal energy glaciers.
3. A canyon is a type of _____.
A. glacier.
B. mountain.
C. plain.
D. valley.
4. Which energy resource does NOT come from Earth?
A. fossil fuels
B. solar energy
C. geothermal energy
D. hydroelectric power
5. Most of Earth's fresh water is found in _____.
E. lakes.
F. oceans.
G. rivers.
6. Which is an example of erosion?
A. Wind blows sand into rocks.
B. Plant roots split apart a boulder.
C. Rain washes soil into a stream.
D. Water flows into cracks in rocks and freezes.
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7. Which represents a nonrenewable resource?
---see pictures
8. Which would cause the most rapid change to rocks on Earth's surface?
A. earthquake
B. glacier
C. waterfall
D. wind
Answer the following in complete sentences.
9. Using the three Rs of conservation can help save natural resources and reduce
pollution. This water jug is made from recycled plastic.
For each of the other two Rs, describe a way that you could practice conservation
using the jug.
10. Weather conditions on hot, dry summer days can increase air pollution. Some
cities offer free bus rides on these days. Explain how free bus rides could reduce
air pollution.
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UNIT C
WRAP-UP
Discover!
Building a dam helps some plants and animals but may harm others. When a
dam is built, it causes flooding and creates a lake where there used to be dry
land. The lake becomes a habitat for fish, birds, and other animals. It may
also be a source of water farmers can use for their crops.
The flooding caused by a dam has harmful effects, too. Water may cover land
areas that are the homes of plants and animals. Some plants will die, and
many animals will have to find new homes.
---see picture
lake
The lake becomes home to fish and other animals.
Flooding forces animals to find new homes and destroys plants.
A power plant produces electricity from moving water.
dam
A dam blocks the natural flow of a river.
See how a dam can change an environment. Go to www.eduplace.com/scp/ to
learn how dam impacts the plants and animals in the area.
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