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HSES_GRSW_C10.QXD 8/4/04 3:31 PM Page 76
Name ___________________________
Chapter 10
Class ___________________
Date _____________
Volcanoes and Other Igneous Activity
Section 10.2 Intrusive Igneous Activity
This section explains how to classify intrusive igneous features and describes
where magma comes from.
Reading Strategy
Comparing and Contrasting After you read, compare the types of
plutons by completing the table. 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.
Types of Plutons
Description
Sill
a. pluton formed parallel with sedimentary rocks, commonly horizontal
Laccolith
b. similar to a sill, but forms a lens-shaped mass that pushes the
overlying strata upward
Dike
c. pluton that cuts across the preexisting rocks
Batholith
d. largest intrusive igneous body with a surface exposure of over 100 km2
Plutons
1.
Select the appropriate letter in the diagram that identifies each
of the following igneous intrusive features.
D
A
B
sill
batholith
laccolith
dike
A
B
2. Is the following sentence true or
false? Plutons can be studied on
Earth’s surface as they form.
false
C
D
Earth Science Guided Reading and Study Workbook
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© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
C
HSES_GRSW_C10.QXD 8/4/04 3:31 PM Page 77
Name ___________________________
Chapter 10
Class ___________________
Date _____________
Volcanoes and Other Igneous Activity
What three characteristics are used to classify intrusive igneous
bodies? shape, size, relationship to the surrounding rock layers
3.
Match each way plutons formed with the pluton type.
How Formed
Pluton
d
c
b
a
when magma from a large
magma chamber invades fractures
in the surrounding rocks
5.
when a large intrusive igneous
body of greater than 100 km2
accumulates and becomes exposed
6.
when magma is injected
between sedimentary layers close
to Earth’s surface and collects as a
lens-shaped mass
7.
when magma is injected along
sedimentary bedding surfaces close
to Earth’s surface
4.
a. sill
b. laccolith
c. batholith
d. dike
Origin of Magma
Is the following sentence true or false? Magma forms when
solid rock in the crust and upper mantle partially melts.
8.
true
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
9.
Circle the letter of one way magma is generated.
a. The confining pressure of rocks is increased.
b. The water content of rocks is reduced.
c. The temperature of rocks is lowered below their melting
points.
d. The temperature of rocks is raised above their melting points.
10. The rate at which temperature changes with depth below Earth’s
surface is called the geothermal gradient .
11. How is decompression melting of rocks triggered?
when the confining
pressure of the rocks drops enough
12.
Wet
rock buried at depth has a much lower
dry
melting temperature than does
rock of the
same composition and under the same pressure.
Earth Science Guided Reading and Study Workbook
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