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Name ______________________________ Class ___________________ Date __________________
Skills Worksheet
Section 14-2 worksheet(pgs 368-371)
Section: Igneous Rock
Circle the letter of the best answer for each question.
1. How are igneous rocks formed?
a. when magma cools and solidifies
b. when sediments are compacted and cemented
c. when heat and pressure squeezes rock
d. when rocks are deformed
ORIGINS OF IGNEOUS ROCK
2. What is one way that magma can form?
a. when rock is cooled
b. when rock is cemented
c. when rock is weathered
d. when rock is heated
3. Besides pressure being released, what other way can magma form?
a. when pressure builds up
b. when rocks solidify
c. when rocks change composition
d. when rocks lose water
4. When magma cools, what does it form?
a. more magma
b. igneous rock
c. sedimentary rock
d. metamorphic rock
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
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Rocks: Mineral Mixtures
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
Circle the letter of the best answer for each question.
5. At what temperature does magma solidify?
a. between 70°C and 125°C
b. at 32°F
c. at 0°C
d. between 700°C and 1,250°C
6. What happens when the minerals in magma have different melting points?
a. Some minerals will become solid before others.
b. Some minerals will never solidify.
c. Some minerals will never melt.
d. All the minerals will solidify at the same temperature.
COMPOSITION AND TEXTURE OF IGNEOUS ROCK
Read the words in the box. Read the sentences. Fill in each blank with
the word or phrase that best completes the sentence.
felsic rocks
fine
cooled
mafic rocks
crystals
7. The more time the ______________________ have to grow, the larger
and coarser the texture is.
8. Aluminum, potassium, silicon, and sodium make light-colored rocks
called ______________________.
9. Dark-colored rocks called ______________________ have more calcium,
iron, and magnesium.
10. Igneous rocks differ from one another in how fast they
______________________.
11. Igneous rocks that have small crystals have ______________________
grains.
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
17
Rocks: Mineral Mixtures
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
IGNEOUS ROCK FORMATIONS
Intrusive Igneous Rock
Circle the letter of the best answer for each question.
12. What kind of rock forms from magma that cools below the Earth’s
surface?
a. intrusive igneous rock
b. sedimentary rock
c. extrusive igneous rock
d. fissures
13. Intrusive igneous rock usually has what kind of texture?
a. coarse-grained
b. medium-grained
c. small-grained
d. fine-grained
14. What is a sheetlike intrusion that is oriented parallel to previous rock
layers called?
a. a stock
b. a batholith
c. a dike
d. a sill
15. What are large, irregular-shaped intrusive bodies called?
a. stocks
b. plutons
c. sills
d. dikes
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
18
Rocks: Mineral Mixtures
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
Circle the letter of the best answer for each question.
16. What are the largest igneous intrusions called?
a. dikes
b. stocks
c. batholiths
d. sills
Extrusive Igneous Rock
17. What is it called when magma erupts on the Earth’s surface?
a. intrusive igneous rock
b. metamorphic rock
c. sedimentary rock
d. extrusive igneous rock
18. Besides volcanoes, where else does lava flow from?
a. fissures
b. sills
c. plateaus
d. batholiths
19. What landform is created when lava flows out of a fissure onto land?
a. a rolling hill
b. a lava plateau
c. a tall mountain
d. a volcanic neck
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
19
Rocks: Mineral Mixtures