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Igneous Rocks
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Instructions: Answer all questions to get your test result.
1) How are igneous rocks formed?
A
from two or more rocks that have morphed together under intense pressure
B
from the cooling & hardening of molten material
C
by being deposited in layers from weathered rock material
D
by slowly being deposited from dripping water on cave floors over time
2) How are igneous rocks classified in general?
A
foliated and nonfoliated
B
basic and acidic
C
organic and inorganic
D
intrusive and extrusive
3) What is NOT a characteristic of granite, a common intrusive igneous rock?
A
It has a phaneritic texture
B
It has a glassy appearance
C
It is mostly made of feldspar and quartz
D
It is generally of a light color
4) Why are the crystals of intrusive igneous rock typically larger than those of extrusive igneous rock?
A
because the temperatures of the magma are much lower
B
because of a higher water content in the magma
C
because the magma cools very quickly
D
because the magma cools much slower
5) What type of intrusive igneous rock texture has the largest crystals?
A
phaneritic
B
aphanitic
C
pegmatitic
D
porphyritic
6) Where are extrusive rock formed?
A
under Earth's mantle
B
at the center of the Earth
C
under layers of ocean floor sedimentation
D
at or near the Earth's surface
7) What condition causes pumice to be so porous?
A
erosion by acid rain that is produced after a volcanic explosion
B
the rapid release of numerous gas bubbles during cooling
C
the loss of the crystals that were formed during cooling
D
the slow cooling of lava
8) What type of texture results when extrusive igneous rock cools so quickly that crystallization does not occur?
A
phaneritic
B
glassy
C
porphyritic
D
aphanitic
9) Which is not a common extrusive igneous rock?
A
basalt
B
granite
C
rhyolite
D
andesite
10) What are the two ways the igneous rock are classified?
A
by radioactivity and polarity
B
by luster and color
C
by heft and specific
D
by composition and texture
*select an answer for all questions
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