Page 148 - Laboratory Manual in Physical Geology

BIG IDEAS PRE-LAB VIDEO

Igneous rocks form wherever magma or lava cool to
a solid state. The composition and texture of igneous
rock samples, and the shapes of bodies of igneous rock,
can be used to classify them and infer their origin. Lava
and igneous rock-forming processes can be observed
at volcanoes, which occur along lithospheric plate
boundaries and hot spots, are linked to underground
bodies of magma, and can pose hazards to humans.

FOCUS YOUR INQUIRY

|
THINK What do igneous rocks look like? How can they
About It be classified into groups?
ACTIVITY 5.1 Igneous Rock Inquiry (p. 130 )

|
THINK What are igneous rocks composed of? How
About It is composition used to classify and interpret
igneous rocks?
ACTIVITY 5.2 Minerals That Form Igneous Rocks (p. 130 )

ACTIVITY 5.3 Estimate Rock Composition (p. 131 )

|
THINK What are igneous rock textures? How is texture
About It used to classify and interpret igneous rocks?
ACTIVITY 5.4 Glassy and Vesicular Textures of Igneous
Rocks (p. 133 )
ACTIVITY 5.5 Crystalline Textures of Igneous Rocks (p. 134 )
5 THINK How are rock composition and texture used to
|
About It classify, name, and interpret igneous rocks?
ACTIVITY 5.6 Rock Analysis, Classification, and
L ABOR A T OR Y Origin (p. 135 )
ACTIVITY 5.7 Thin Section Analysis and Bowen’s Reaction
Series (p. 135 )
Igneous Rocks and ACTIVITY 5.8 Analysis and Interpretation of Igneous
Rocks (p. 141 )
Processes THINK How can the shapes of bodies of igneous rock be
|
About It used to classify them and infer their origin?

C ONTRIBUTING A UTHORS ACTIVITY 5.9 Geologic History of Southeastern
Harold E. Andrews • Wellesley College Pennsylvania (p. 142 )
James R. Besancon • Wellesley College
Claude E. Bolze • Tulsa Community College
Margaret D. Thompson • Wellesley College

Explosive volcanic eruptions like this one eject partially molten
volcanic bombs that become rounded and cool as they fly through
the air. (Superstock)
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