Quiz History_ Exam 2
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School
Tarrant County College, Fort Worth *
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Course
1403
Subject
Geology
Date
Dec 6, 2023
Type
Pages
18
Uploaded by CaptainNightingale2524
Exam 2 Results
Correct answers are hidden.
Score for this quiz:
46
out of 50
Submitted Sep 27 at 10:17am
This attempt took 37 minutes.
1 / 1 pts
Question 1
Igneous rocks with a two-stage intrusive-extrusive origin are recognized by a
texture that is:
aphanitic.
porphyritic.
glassy.
phaneritic.
pyroclastic.
1 / 1 pts
Question 2
In igneous rocks with porphyritic texture, the larger minerals are
phenocrysts, and the smaller minerals collectively make up the groundmass.
True
False
1 / 1 pts
Question 3
Most igneous rocks are classified by:
texture.
composition.
size.
texture and composition.
composition and size.
1 / 1 pts
Question 4
Bowen's reaction series explains why Si-rich minerals are the last to
crystallize from a magma.
True
False
0 / 1 pts
Question 5
Incorrect
Incorrect
The lowest temperature mineral on Bowen's reaction series is olivine.
True
False
1 / 1 pts
Question 6
Although all compositions are represented, most plutons are:
felsic rocks.
intermediate rocks.
mafic rocks.
felsic and mafic rocks.
felsic, intermediate and mafic rocks.
1 / 1 pts
Question 7
Erupting lavas generally have a temperature in the range of 700
°
to 1200
°
F.
True
False
1 / 1 pts
Question 8
The process of assimilation results in the cooling of an intruding magma.
True
False
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1 / 1 pts
Question 9
Bowen's reaction series explains the order of mineral formation with
decreasing temperature.
True
False
1 / 1 pts
Question 10
When magma cools slowly, crystal growth proceeds at a relatively
____________________ speed, and the resultant rock is
____________________ in texture.
slow, phaneritic
1 / 1 pts
Question 11
Mantle plumes are the cause of linear volcanic chains and probably flood
basalts.
True
False
1 / 1 pts
Question 12
Natural glass, such as obsidian, forms when magma:
cools too rapidly for crystals to form.
cools rapidly and very tiny crystals form.
cools too slowly for crystals to form.
doesn't cool.
none of these.
1 / 1 pts
Question 13
Incorrect
Incorrect
Andesite and ____________________ are respectively
____________________-trusive and ____________________-trusive rocks
formed in volcanic chains along ____________________ plate boundaries.
diorite, extrusive, intrusive, convergent
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Question 14
The largest intrusive bodies are called ____________________, and, by
definition, they must have at least ____________________ square
kilometers of surface area.
batholiths, 100
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Question 15
Aphanitic, phaneritic, and porphyritic are textural terms that:
refer to fine-grained, course-grained, and mixed-grained crystal sizes,
respectively.
refer to formation by slow cooling, fast cooling, and mixed cooling rates,
respectively.
are indicative of volcanic, plutonic, and mixed plutonic-volcanic origins,
respectively.
refer to fine-grained, course-grained, and mixed-grained crystal sizes,
respectively, AND are indicative of volcanic, plutonic, and mixed plutonic-
volcanic origins, respectively.
all of these.
1 / 1 pts
Question 16
Large crystals found in a fine-grained groundmass can indicate:
origin from a magma with an early intrusive phase followed by an extrusive
phase.
origin from a magma with an early extrusive phase followed by an intrusive
phase.
a rock of mixed volcanic-plutonic origin.
origin from a magma with an early intrusive phase followed by an extrusive
phase AND a rock of mixed volcanic-plutonic origin.
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origin from a magma with an early extrusive phase followed by an intrusive
phase AND a rock of mixed volcanic-plutonic origin.
1 / 1 pts
Question 17
Banded iron formations consist of alternating thin layers of chert and iron
minerals.
True
False
1 / 1 pts
Question 18
A(n) ____________________ soil forms where the parent material has
weathered, whereas ____________________ soil develops from eroded
material that was weathered at another location.
residual, transported
1 / 1 pts
Question 19
Hydrocarbons can be widespread in sedimentary rock, but reservoirs are
formed by:
porous and permeable beds bounded on all sides by impermeable rock.
large cavities, such as cave systems in limestone reefs.
structural traps.
porous and permeable beds bounded on all sides by impermeable rock AND
structural traps.
all of these.
0 / 1 pts
Question 20
Incorrect
Incorrect
____________________ is an essential component of soil as it provides
nutrients to plants and increases the ability of the soil to retain
____________________.
humus
1 / 1 pts
Question 21
____________________ form when layers are deposited at an angle to the
surface and the layers dip in direction of ____________________.
Cross-beds, flow
1 / 1 pts
Question 22
A(n) ____________________ occurs when the sea advances landward.
transgression
1 / 1 pts
Question 23
The most important factor controlling soil formation is
____________________.
Climate
1 / 1 pts
Question 24
Cross-beds indicate that current flow changed direction and the new
direction flows across the old direction at an angle.
True
False
1 / 1 pts
Question 25
Detrital sediments and rocks are classified by:
mineral composition.
grain size.
the conditions in which they formed.
mineral composition and grain size.
composition, origin, and texture.
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1 / 1 pts
Question 26
The designation of sediment grain size, from largest to smallest, is:
clay, silt, sand, gravel.
gravel, sand, silt, clay.
gravel, silt, sand, clay.
clay, sand, gravel, silt.
silt, clay, gravel, sand.
1 / 1 pts
Question 27
The rocks on the bottom of a pile of sedimentary rocks are
____________________ in age than the rocks above them.
Older
1 / 1 pts
Question 28
Laterite soils are typical of rainforests.
True
False
1 / 1 pts
Question 29
Humus:
is the material always comprising the topmost soil horizon.
is dark, organic-rich material formed by bacterial decay.
is leaf-litter.
must include sediments.
none of the above
1 / 1 pts
Question 30
Sedimentary layers in which grain size decreases from bottom to top are
called graded beds.
True
False
1 / 1 pts
Question 31
Frost wedging in the mountains produces talus.
True
False
1 / 1 pts
Question 32
Chemical sedimentary rocks generally have an interlocking grain texture
called:
clastic.
porphyritic.
particulate.
crystalline.
detrital.
1 / 1 pts
Question 33
If all of the grains in a sedimentary rock are about the same size, shape, and
composition, the rock can be characterized as:
cemented.
compacted.
cross-bedded.
graded.
well sorted.
1 / 1 pts
Question 34
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Divergent plate boundaries are characterized by:
hydrothermal alteration and contact metamorphism.
regional and contact metamorphism.
regional and dynamic metamorphism.
dynamic and contact metamorphism.
hydrothermal alteration and dynamic metamorphism.
1 / 1 pts
Question 35
If a rock is exposed to such high temperatures that it melts, it forms a(n)
____________________ and becomes a(n) ____________________ rock.
magma, igneous
1 / 1 pts
Question 36
Which of the following lists of foliated rock types is arranged according to
increasing coarseness of texture?
slate, phyllite, gneiss, schist
slate, amphibolite, schist, phyllite
schist, phyllite, gneiss, slate
slate, phyllite, schist, gneiss
schist, phyllite, amphibolite, gneiss
0 / 1 pts
Question 37
Incorrect
Incorrect
Contact metamorphism along sills and dikes may produce metamorphosed
zones many kilometers wide.
True
False
1 / 1 pts
Question 38
Incorrect
Incorrect
A rock with segregated light and dark bands, containing the minerals quartz,
feldspar, hornblende, and mica, is a(n) ____________________ gneiss.
high grade
1 / 1 pts
Question 39
The pressure exerted on rocks by the weight of overlying rocks is called
____________________ pressure. With this type of pressure, the stress on
the rock is the ____________________ in all directions.
lithostatic, same
1 / 1 pts
Question 40
One plate tectonic process that causes very widespread metamorphism is
____________________.
subduction
1 / 1 pts
Question 41
As the plate subducts until it begins to melt, it generates
____________________, which rises and causes ____________________
metamorphism.
magma, contact
0 / 1 pts
Question 42
Incorrect
Incorrect
The intensity of regional metamorphism may be recognized by:
index of recrystallization.
index fossils.
index minerals.
index polymorphs.
index cards.
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1 / 1 pts
Question 43
In schist with a rotated garnet crystal, geologists know that
____________________ pressure was unequally applied during
metamorphism.
differential
1 / 1 pts
Question 44
Metamorphism is a physical and chemical change that occurs in such a way
that:
disequilibrium is reached with the new physical and chemical environment.
a dynamic equilibrium is reached.
equilibrium with the new environment is disturbed.
the rock reaches equilibrium with its new environment.
the rock's chemistry and texture become increasingly unstable.
1 / 1 pts
Question 45
The index minerals that form in a metamorphic rock depend on the
composition of the parent rock affected.
True
False
1 / 1 pts
Question 46
Only magmatic fluids, not pore fluids of the country rock, have an effect on
contact metamorphism.
True
False
1 / 1 pts
Question 47
An example of a region where mylonites are formed is the:
Cascade Range.
mid-oceanic ridges.
San Andreas Fault Zone.
Valles Marianas Rift Zone.
Mendocino Fracture Zone.
1 / 1 pts
Question 48
Metamorphic rocks may form from:
igneous rocks.
sedimentary rocks.
other metamorphic rocks.
both igneous and sedimentary rocks
igneous, sedimentary or metamorphic rocks
1 / 1 pts
Question 49
The type of metamorphism that typically produces the hard, dense, fine-
grained rocks called mylonites is called ____________________.
Dynamic
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Question 50
The temperature of the intrusive magma has little effect on the metamorphic
minerals formed.
True
False
Quiz Score:
46
out of 50
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