Skills Worksheet
pages 352-357
Directed Reading A - 10.3- Answer Key
Section: Erosion and Deposition by Ice
1. What is a glacier?
A glacier is an enormous mass of moving ice.
GLACIERS—RIVERS OF ICE
Place the four steps involved in formation of glaciers in order from first to last.
Write the appropriate number in the space provided.
4_____ 2. Gravity pulls on the gigantic mass of the ice packs, setting them
in motion.
1_____ 3. Snow piles up year after year in polar regions and high elevations.
3_____ 4. Ice crystals form a huge mass of ice.
2_____ 5. The weight of the top layers of snow causes the deep-packed snow to
become ice crystals.
6. Why do glaciers flow like “rivers of ice”?
Glaciers are so massive, the pull of gravity causes them to flow slowly.
7. How and where are valley glaciers formed?
Valley glaciers form in valleys that were created by stream erosion. The glaciers
slowly flow downhill and widen and straighten the valley into “U” shapes.
8. What type of glacier forms in mountain areas?
Alpine glaciers form in the mountain areas.
9. What is a continental glacier?
A continental glacier is a huge, continuous mass of ice that stretches across
entire continents.
10. Describe the two ways glaciers move.
Sliding: The glaciers weight causes ice at the bottom to melt and the glacier
slides on the metled water. Flowing: Ice crystals in the glacier slip over each
other, and the upper part flows faster than the bottom.
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Agents of Erosion and Deposition
Directed Reading A continued
LANDFORMS CARVED BY GLACIERS
Match the correct description with the correct term. Write the letter in the space
provided.
B____11.smaller glacial valleys that join the
deeper main valley
D____12.bowl-like depressions where glacial
ice cuts into the mountain walls
A____13.pyramid-shaped peaks that form when
three or more cirque glaciers erode a
mountain
a.
b.
c.
d.
e.
horns
hanging valleys
arêtes
cirques
U-shaped valleys
C____14.jagged ridges that form between two or
more cirques cutting into the same
mountain
E____15.valleys formed when a glacier erodes a
river valley from itsoriginal V shape
TYPES OF GLACIAL DEPOSITS
16. All material carried and deposited by glaciers is called
glacial drift.
17. What are the two main types of glacial drift?
The two main types of glacial drifts are till and stratified drift.
18. Unsorted rock material that is deposited directly by the ice when it melts is
called till.
19. A glacial deposit that is sorted and layered by streams or meltwater is called
stratified drift.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Agents of Erosion and Deposition
Directed Reading A continued
Identify each of the following descriptions as stratified drift (S) or till deposit (T),
and write S or T in the space provided.
S____ 20.Sediment built around a block of ice eventually forms a kettle.
T____ 21. Ridges are formed along the edges of glaciers.
S____ 22.Streams from glaciers carry sorted material to an area called an outwash
plain.
T____ 23. Moraines form ridges along the edges of glaciers.
Match the correct definition with the correct term. Write the letter in the space
provided.
C____ 24. forms from till left beneath a glacier
D____ 25. forms when sediment is dropped at the
front of a glacier
B____ 26. forms along the sides of a glacier
a. medial moraine
b. lateral moraine
c. ground moraine
d. terminal moraine
A____ 27. forms when valley glaciers with
moraines along each side meet
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Agents of Erosion and Deposition