GEOLOGY 12
STUDY GUIDE
CHAPTER 3 IGNEOUS ROCKS AND PROCESSES
Name __________________
Major Concepts
1.
2.
3.
4.
5.
6.
7.
Rocks are solid, cohesive aggregates of one or more minerals (or mineral materials).
Rocks are divided into three classes based on the way they are formed.
The rock cycle outlines how rocks are changed over time.
Silicate magmas originate at depths within the earth where temperatures high enough
to melt rocks.
Bowen’s Reaction Series explains why magmas crystallize over a range of temperatures.
Igneous rocks are classified by texture and composition.
Igneous intrusions come in many shapes and sizes.
Terms and Phrases
Chapter 2
elastic limit
igneous
metamorphic
porosity
rock cycle
sedimentary
strain
tensile stress
Chapter 3
assimilation
Bowen’s Reaction Series
chilled margins
concordant
continuous reaction series
country rock
discontinuous reaction series
discordant
felsic
fractional crystallization
fractures
glassy
groundmass
igneous
intrusions
mafic
magma mixing
partial melting
pegmatite
phase diagrams
phenocrysts
pluton
porphyritic
solid solutions
thin sections
vesicular
volatiles
wallrock
aphanetic*
phaneritic*
*needed for crossword
Introductory Assignments
1.
2.
3.
4.
5.
Define or explain the terms and phrases listed above.
Rewrite the Summary on page 54 in point form.
Review chapter by paying special attention to the diagrams, photos and their
captions. Read text for clarification.
Complete the Main Topic Questions below.
Highlight the main ideas on reading supplements (see handouts).
Main Topic Questions
1.
2.
3.
4.
5.
6.
Which terms are used to classify rocks and to describe rock properties?
Which terms are used to discuss the melting of rocks to form magmas?
Which terms are used to describe the crystallization of magmas?
Which terms represent three ways to alter the compositions of magmas?
Which terms are used to describe (or observe) textures of igneous rocks?
Which terms are used to describe characteristics of intrusive rock structures?
cont’d…
Assignments and Activities
•
•
•
•
•
•
CDROM – The Wonders of Rocks and Minerals (if not completed in Chapter 4)
Rock Cycle WS’s
Chapter 3 WS
Complete Questions for Review #1-11 p.55
Complete Additional Questions for Review (see below)
Lab Activity – Igneous Rocks
Additional Questions for Review: The Rock Cycle
1.
What is the elastic limit of a solid under stress? What happens when a material is
stressed beyond its elastic limit?
2.
The behavior of rocks under stress varies with depth. Briefly explain.
Follow-Up and Evaluation
•
•
•
Rock Cycle Exercise (see Rock Cycle WS’s)
Igneous Rocks Crossword
Chapter 3 QUIZ