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Earth Science (ESC 2000) Exam Chapter 2

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an igneous rock that cools rapidly is likely to have ________ crystals.

Exam chapter 2 Spring 2018, questions and answers

University

University of North Florida

Foundations of Earth Science, 7e (Lutgens)
Chapter 2 Rocks: Materials of the Solid Earth
2.1 Multiple Choice
1) An igneous rock that shows a vesicular texture ________.
A) contains many small holes, like Swiss cheese
B) must be extrusive
C) must be fine grained
D) all of the above

2) An igneous rock that cools rapidly is likely to have ________ crystals.
A) small
B) medium-sized
C) large
D) pink

Examine the rock sample here. Did it form at the surface or below the surface, and how do you
know?
A) It formed at the surface, because of its color (composition).
B) It formed at the surface, because of its texture (grain size).
C) It formed below the surface, because of its color (composition).
D) It formed below the surface, because of its texture (grain size).

4) Which one of the following is an igneous rock?
A) limestone
B) rhyolite
C) slate
D) quartz

5) Which one of the following is a sedimentary rock?
A) limestone
B) rhyolite
C) slate
D) quartz

6) Which one of the following is a metamorphic rock?
A) limestone
B) rhyolite
C) slate
D) quartz

7) Rocks that contain crystals that are roughly equal in size and can be identified with the
unaided eye are said to exhibit a ________ texture.
A) fine-grained
B) coarse-grained
C) glassy
D) porphyritic

8) Magma that might have cooled slowly to produce a diorite is instead erupted at Earth’s
surface. It would chill rapidly and produce a(n) ________.
A) rhyolite
B) andesite
C) basalt
D) granite

9) Which igneous texture is characterized by two distinctively different crystal sizes?
A) fine-grained
B) coarse-grained
C) glassy
D) porphyritic

10) Granite is ________.
A) what countertops are made of
B) coarse-grained and dominated by quartz and feldspar crystals
C) coarse-grained and dominated by olivine, pyroxene and plagioclase feldspar crystals
D) fine-grained and dominated by quartz and feldspar crystals

11) To transform an igneous rock into a sedimentary rock, which of the following processes must
take place?
A) melting and re-cooling, followed by crystallization
B) chemical reactions under conditions of elevated temperature or pressure
C) weathering, transport, deposition, and lithification
D) impact by a meteorite

A) The early-formed silicates are enriched in iron and magnesium, resulting in such rocks as
andesite and granite. As crystallization proceeds, the later-formed silicates are enriched in
sodium, potassium, and silicon, resulting in peridotite and basalt.
B) The early-formed carbonates are enriched in calcium and carbonate, resulting in such rocks as
limestone. As crystallization proceeds, the later-formed carbonates are enriched in fossils,
resulting in fossiliferous limestone and coquina.
C) The early-formed silicates are enriched in iron and magnesium, resulting in such rocks as
peridotite and basalt. As crystallization proceeds, the later-formed silicates are enriched in
sodium, potassium, and silicon, resulting in andesite and granite.
D) The early-formed silicates are enriched in sodium, potassium, and silicon, resulting in such
rocks as peridotite and basalt. As crystallization proceeds, the later-formed silicates are enriched
in iron and magnesium, resulting in andesite and granite.

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Earth Science (ESC 2000) Exam Chapter 2

 

 

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