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Multiple Choice
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1

Igneous rocks are
A)the most common rock type in the earth's crust.
B)mostly found on the surface of the earth.
C)slightly altered from previously existing rocks.
D)precipitated from dissolved materials from other rocks.
2

A fine-crystalline igneous rock is probably
A)intrusive.
B)extrusive.
C)precipitated.
D)deposited after water evaporates.
3

Minerals that break along certain planes have
A)fracture.
B)cleavage.
C)shear.
D)crystallinity.
4

Rhyolite (fine-crystalline) is to granite (coarse-crystalline) as basalt is to
A)muscovite.
B)obsidian.
C)gabbro.
D)garnet.
5

Ferromagnesian minerals
A)tend to crystallize first from a slowly cooling magma.
B)are rich in silicon and lack iron and magnesium.
C)are the last to form from a slowly cooling magma.
D)are metamorphic in nature.
6

Residual elements that did not fit into the crystal structure of minerals formed during cooling
A)crystallize along with quartz in rock fractures.
B)form sedimentary rocks.
C)are eventually washed into the sea.
D)precipitate out as carbonate minerals.
7

Most rocks are composed of minerals that are
A)carbonaceous.
B)metamorphic.
C)silicate.
D)igneous.
8

Particles resulting from weathering of rocks are compressed and cemented to form
A)sedimentary rocks.
B)metamorphic rocks.
C)igneous rocks.
D)ferromagnesians.
9

Conglomerate, sandstone, and claystone are identified by
A)mineral composition.
B)hardness.
C)degree of compaction.
D)particle size.
10

Which of the following statements about metamorphic rocks is not true?
A)They are formed when existing rocks are subjected to heat and pressure.
B)Foliation is the property of a rock resulting in rock cleavage.
C)Gneiss to schist to slate is a continuous transition in the metamorphism of shale.
D)Quartzite is a metamorphic form of sandstone.





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