Chapter 3 Guided Reading Assignment #2
1. Read: 70-74
2. Define the following terms:
a)
b)
c)
d)
Intrusive igneous rock
Extrusive igneous rock
Porphyritic texture
Granitic composition
e) Basaltic compostition
f) Andestic compostion
g) Ultramafic
3. List the three key concepts for this section.
4. How do igneous rocks form?
5. Examine figure 5 on page 70. Describe what is happening in the picture.
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6. What does the Latin word “ignis” mean?
7. Where does the term intrusive come from?
8. Why do we see intrusive rocks at all.
9. Do igneous rocks form from lava or magma? Explain.
10. How are magma similar and different?
11. Where does the term extrusive come from?
12. Summarize the rock cycle.
13. Examine figure 6 a and b. How are the two rocks different?
CPHS Physical Geology
Mr. G. Edelman
14. In the table below give the similarities and differences between intrusive and
extrusive.
SIMILARITIES
DIFFERENCES
INTRUSIVE
EXTRUSIVE
15. What are the two main characteristics used to classify igneous rocks?
16. In the table below, describe the seven different classes of igneous rocks.
CLASSIFICATION
GENERAL DESCRIPTION
1.
2.
3.
4.
5.
6.
7.
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CPHS Physical Geology
Mr. G. Edelman