Test Bank For Physical Geology 14th Edition by Plummer
Chapter 03
Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks
True / False Questions
1. Rhyolite is considerably more common than granite.
FALSE
Bloom’s Level: 2. Understand
Topic: Igneous Environments
2. Diorite and andesite are composed of similar amounts of feldspars and ferromagnesian minerals.
TRUE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
3. Lava is magma on the Earth’s surface.
TRUE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
4. Extrusive igneous rocks are typically fine grained because they crystallized slowly, deep below the Earth’s surface.
FALSE
Bloom’s Level: 2. Understand
Topic: Igneous Environments
5. A dike is a discordant intrusive igneous structure.
TRUE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
6. The geothermal gradient is the rate at which pressure increases with increasing depth beneath the surface.
FALSE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
7. Mafic igneous rocks are silica-poor.
TRUE
Bloom’s Level: 2. Understand
Topic: Igneous Environments
8. A mineral’s melting point generally increases with increasing pressure.
TRUE
Bloom’s Level: 2. Understand
Topic: Igneous Environments
9. Although batholiths may contain mafic and intermediate rocks, they almost never composed of granite.
FALSE
Bloom’s Level: 2. Understand
Topic: Igneous Environments
10. The sequence in which minerals crystallize in a cooling igneous melt is called Bowen’s Reaction Series.
TRUE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
11. The continuous branch in Bowen’s Reaction Series contains the ferromagnesian minerals.
FALSE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
12. A pluton is an igneous structure that crystallized at very shallow depths.
FALSE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
13. Partial melting of the lower continental crust produces a silicic magma that eventually solidifies into granite or rhyolite.
TRUE
Bloom’s Level: 2. Understand
Topic: Igneous Environments
14. An ultramafic rock is composed almost entirely of quartz.
FALSE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
15. The term mafic comes from the terms magnesium and ferric.
TRUE
Bloom’s Level: 1. Remember
Topic: Igneous Environments
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