Download Section 11.3 Mountains and Plates

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Name ___________________________
Chapter 11
Class ___________________
Date _____________
Mountain Building
Section 11.3 Mountains and Plates
This section explains how mountains are formed at plate boundaries.
Reading Strategy
Outlining As you read, make an outline of the important ideas in this
section. Use the green topic headings as the main topics and the blue
headings as subtopics. 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.
I. Mountains and Plates
A. Convergent Boundary Mountains
1. Ocean-Ocean Convergence
2. Ocean-Continental Convergence
3. Continent-Continent Convergence
B. Divergent Boundary Mountains
C. Non-Boundary Mountains
D. Continental Accretion
1. Terranes
2. Mountains from Accretion
Convergent Boundary Mountains
2.
Colliding plates
provide the compressional forces that fold,
fault, and metamorphose the thick layers of sediment deposited at
the edges of landmasses.
3. Circle the letter of each true statement about ocean-ocean
convergence.
a. Ocean-ocean convergence occurs when an oceanic plate
converges with a continental plate.
b. The converging plates can lead to the growth of a volcanic island
arc on the ocean floor.
c. An example of an island arc formed by ocean-ocean convergence
is Japan.
d. Ocean-ocean convergence mainly produces volcanic mountains.
4.
Is the following sentence true or false? The types of mountains
formed by ocean-continental convergence are volcanic mountains
true
and folded mountains.
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1. Is the following sentence true or false? Most mountain building
true
occurs at convergent plate boundaries.
0078_phes09_GRSW_Ch11.QXD 5/9/07 3:36 PM Page 83
Name ___________________________
Chapter 11
Class ___________________
Date _____________
Mountain Building
5. The figure illustrates mountain building along an Andean-type
subduction zone. Select the appropriate letter in the figure that
identifies each of the following features.
C
ocean trench
A
asthenosphere
E
continental volcanic arc
D
accretionary wedge
B
subducting oceanic lithosphere
E
D
Deformed
marginal
sediments
C
B
B
100 km
Melting
A
6.
Is the following sentence true or false? At a convergent
boundary, a collision between two plates carrying continental
crust will result in the formation of folded mountains.
true
7.
Fault-block
mountains are formed along ocean
ridges at divergent plate boundaries.
Non-Boundary Mountains
8. Why are some mountains forming at non-plate boundaries?
Volcanic mountains are forming in locations of volcanic hot spots or volcanic activity.
Many fault-block mountains occur in areas that are undergoing regional extension or stretching.
Continental Accretion
terranes
9. When crustal fragments called
collide with
a continental plate, they become stuck to or embedded into the
accretion
continent in a process called
.
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Divergent Boundary Mountains
0078_phes09_GRSW_Ch11.QXD 5/9/07 3:36 PM Page 84
Name ___________________________
Chapter 11
Class ___________________
Date _____________
Mountain Building
WordWise
Solve the clues to determine which vocabulary terms from Chapter 11 are
hidden in the puzzle. Then find and circle the terms in the puzzle. The terms
may occur vertically, horizontally, diagonally, or backwards.
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
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Clues
The general term that refers to all changes in the
shape or size of a rock body
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Hidden Words
deformation
Force per unit area acting on a solid
stress
The change in shape or volume of a body of rock as a
result of stress
strain
Commonly formed by the upfolding, or arching, of
rock layers
anticline
A trough associated with anticlines
syncline
A large, step-like fold in otherwise horizontal
sedimentary strata
monocline
The collection of processes that produce a mountain belt
orogenesis
terrane
Any crustal fragment that has a geologic history
distinct from the adjoining accreted crustal blocks
Mountains formed as large blocks of crust are uplifted
and tilted along normal faults
fault-block
The process in which fragments become embedded or
stuck to a continental plate
accretion
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