Department
of Earth Science |
Northeastern
Illinois University
INTRODUCTION
TO EARTH SCIENCE
ESCI 121
Section 05
Spring 2009
Daily
Objectives #13
(March 3, 2009)
Dr. Sanders
By the end of today's class, you should be able to do the following:
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Explain what is required of you in Homework #4.
Igneous Rocks
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Explain how igneous rocks form, and tell in what part
of the Earth they form.
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Explain how we can classify igneous rocks on the basis of
crystal size/cooling rate, and list the three main categories within that
classification scheme.
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Explain how we can classify igneous rocks on the basis of
mineralogic composition, and list the three main categories within that
classification scheme.
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Using the terms mafic and felsic,
describe the composition of the oceanic crust, continental crust, oceanic
lithosphere, and continental lithosphere.
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Examine hand samples of igneous rocks and tell whether they
are intrusive or extrusive.
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Examine hand samples of igneous rocks and tell whether they
are plutonic or volcanic.
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Examine hand samples of igneous rocks and tell whether they
are mafic, intermediate, or felsic.
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Examine hand samples of igneous rocks and assess the rate at
which they cooled: slow, fast, or virtually instantly.
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Based on cooling rate and crystal size, tell whether an
igneous rock probably cooled above ground, or below.
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Describe the characteristics of granite and
basalt, and identify these rocks in hand sample.
Metamorphic Rocks
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Explain how metamorphic rocks form, and tell in what part of
the Earth they form.
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Explain the difference between regional and contact
metamorphism.
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Describe the two general changes that affect rocks during
metamorphism: recrystallization and foliation.
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Explain the term protolith.
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Explain the term color-banding and tell what
rock exhibits this feature.
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Given protoliths of clay, granite, limestone, and sandstone,
describe the rocks that result after metamorphism.
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Using hand samples of metamorphic rocks, tell which are
foliated and which are non-foliated.
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Describe the characteristics of the following rocks, and
identify them in hand sample:
schist
marble phyllite
quartzite gneiss
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Examine, describe, classify, and name the
metamorphic rocks in your rock kit: #101, 107, 109, 115, 116, 131, 140, 147.
Copyright 2009 Laura L. Sanders. Last updated March 3, 2009.