Name ___________________________
Chapter 23
Class ___________________
Date _____________
Earth’s Surface
Section 23.4 Glaciers and Wind
(pages 719–724)
This section describes how glaciers form and how landscape features are
created. It also describes wind erosion and deposition.
Reading Strategy
(page 719)
Sequencing As you read, complete the flowchart to show how a
glacier forms and moves, and how it erodes and deposits sediment.
For more information on this Reading Strategy, see the Reading and
Study Skills in the Skills and Reference Handbook at the end of
your textbook.
Snow is compacted
to form glacial ice.
The glacier erodes
underlying rock through
plucking and abrasion and
deposits till at its front
and sides as it melts.
Gravity pulls the
glaciers slowly downhill.
How Glaciers Form and Move
(page 719)
1. Glaciers form in places where snow melts
than it falls.
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Match the type of glacier to its description.
Description
a
b
Glacier Type
2. Found in high mountain valleys
3. Covers a continent or large island
Glacial Erosion and Deposition
faster
a. valley glacier
b. continental glacier
(pages 720–722)
4. What are the two ways through which glaciers erode rock?
Plucking
Abrasion
a.
b.
5. Circle the letters of the sentences that are true about glacial erosion.
a. Glacial ice widens cracks in bedrock beneath a glacier.
b. Pieces of loosened rock stick to the top of a glacier.
c. Rocks stuck to the bottoms and sides of a glacier act
like sandpaper, scraping rock and soil.
d. As a glacier moves, it gently brushes the rocks and soil
underneath it.
6. What are four distinctive features caused by glacial erosion?
Cirques
a.
Horns or ridges
b.
U-shaped valleys
c.
Glacial lakes
d.
Physical Science Reading and Study Workbook
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Chapter 23 291
Name ___________________________
Chapter 23
Class ___________________
Date _____________
Earth’s Surface
7. Large bowl-shaped valleys carved high on a mountainside are
cirques
called
.
8. How does a U-shaped valley form? It forms when a glacier flows through and erodes
a V-shaped valley.
9. Is the following sentence true or false? Continental glaciers fill
depressions in the surface with water, where they create cirques.
false
10. How does a glacier create landforms?
As it moves, it transports rock and soil, and
when it melts, it deposits this load of sediment.
11. Mounds of sediment at the downhill end of a glacier are called
moraines
.
Match each feature formed by glacial deposition to its correct description.
Description
Feature Formed
d
a
e
b
Wind Erosion and Deposition
a. outwash plain
b. erratics
c. eskers
d. drumlins
e. kettle lake
(pages 723–724)
17. Name two ways that wind erodes the land.
Abrasion
Deflation
a.
b.
18. Is the following sentence true or false? Deflation happens when
the wind picks up and carries away loose surface material.
true
19. Circle the letters of the features deposited by wind.
a. cirques
b. glacial lakes
c. sand dunes
d. loess deposits
20. Is the following sentence true or false? Deposits formed from
true
windblown dust are called loess deposits.
292
Physical Science Reading and Study Workbook
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Chapter 23
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
c
12. Long teardrop-shaped
mounds of till
13. A flat plain made of
particles of rock that
were deposited from
glacial streams
14. A lake formed where large
blocks of glacial ice become
buried and melt
15. Ridges made from sand and
gravel that were deposited
in the bed of a glacial stream
16. Boulders that a glacier has
carried away from their
place of origin