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Igneous Rocks
Test Description: Igneous rock review
Instructions: Answer all questions to get your test result.
1) Which characteristic provides the best evidence that this pegmatite solidified deep underground?
A
felsic composition
B
very coarse texture
C
light color
D
low density
2) Which texture best describes an igneous rock that formed deep underground?
A
coarse grained
B
vesicular
C
fine grained
D
glassy
3) Which processes lead directly to the formation of igneous rock?
A
compaction and cementation
B
weathering and erosion
C
heat and pressure
D
melting and solidification
4) Mineral crystals of quartz, biotite mica, and amphibole are produced primarily by the
A
deposition of sediments by a glacier
B
cooling and solidification of magma
C
metamorphism of bituminous coal
D
chemical reaction of elements in seawater
5) Obsidian's glassy texture indicates that it formed
A
quickly, on Earth's surface
B
slowly, deep below Earth's surface
C
slowly, on Earth's surface
D
quickly, deep below Earth's surface
6) Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is composed mainly of plagioclase feldspar, olivine, and pyroxene?
A
rhyolite
B
obsidian
C
gabbro
D
scoria
7) Which igneous rock has a vesicular texture and contains the minerals potassium feldspar and quartz?
A
andesite
B
scoria
C
pegmatite
D
pumice
8) What is the origin of fine-grained igneous rock?
A
lava that cooled slowly on Earth's surface
B
silt that settled slowly in ocean water
C
lava that cooled quickly on Earth's surface
D
silt that settled quickly in ocean water
9) Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole?
A
gabbro
B
rhyolite
C
granite
D
basalt
10) Which characteristic provides the best evidence that this pegmatite solidified deep underground?
A
felsic composition
B
light color
C
very coarse texture
D
low density
11) Which process could lead directly to the formation of pumice rock?
A
metamorphism of unmelted rock material
B
precipitation of minerals from evaporating seawater
C
deposition of quartz sand
D
explosive eruption of lava from a volcano
12) When granite melts and then solidifies, it becomes
A
a sedimentary rock
B
sediments
C
a metamorphic rock
D
an igneous rock
13) Which common rock is formed from the solidification of molten material?
A
coal
B
rock gypsum
C
slate
D
rhyolite
14) Which process is necessary for the formation of igneous rocks?
A
metamorphism
B
deposition
C
solidification
D
erosion
15) Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
A
distorted bands of large mineral crystals
B
noncrystalline glassy texture
C
mineral cement between grains
D
layers of rounded fragments
*select an answer for all questions
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