Download Test 3, 2nd Quarter: Rocks

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Rock Test
7 Grade Earth Science and Chemistry
th
DO NOT WRITE ON THIS PART OF THE TEST!!!!!!!
Part I. Choose the answer the BEST answers the question or completes the sentence in the following
statements. 2 points each (60 points total). Place your answers on the scantron!
1. Rock-forming minerals, which compose the majority of rocks found on our planet, include all of the
following EXCEPT
a. Quartz
b. Feldspar
c. Calcite
d. Titanium
e. gypsum
2. The earth’s layers include the crust, mantle, and core. The thinnest and most brittle layer of the three
is the:
a. Crust
b. Mantle
c. Core
3. The lithosphere refers to
a. The crust only
b. The crust and all of the mantle together
c. The crust and the uppermost mantle
d. The layer of the mantle just below the asthenosphere
e. The entire mantle region
4. Grain shape is an especially important characteristic of
a. Igneous rocks
b. Metamorphic rocks
c. Sedimentary rocks
d. All rocks
e. None of the rock types
5. Rock that forms from the cooling of magma below or at the surface of the earth is called
a. sedimentary rock
b. metamorphic rock
c. igneous rock
d. chemical rock
e. none of the above
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6. Magma that reaches the earth’s surface and cools can be referred to as
a. Extrusive igneous rock
b. Intrusive igneous rock
c. Lava
d. a and c are correct
e. b and c are correct
7. The most abundant intrusive igneous rock is
a. Diorite
b. Basalt
c. Granite
d. Gabbro
e. Obsidian
8. The most abundant extrusive igneous rock is
a. Diorite
b. Basalt
c. Granite
d. Gabbro
e. Obsidian
9. Igneous rock that cools very quickly when it forms may have a texture that is
a. Smooth and shiny with no visible grain
b. Multicolored and banded
c. Phaneritic
d. Made up of jagged grains
e. Pegmatitic
10. When all of the grains in an igneous rock are visible, the rock is described as
a. Aphanitic
b. Phaneritic
c. Pegmatitic
d. Porphyritic
e. Vesicular
11. When all grains in an igneous rock are too small to see with the naked eye, the rock is described as
a. Aphanitic
b. Phaneritic
c. Pegmatitic
d. Porphyritic
e. Vesicular
12. An igneous rock texture that is characterized by small to large holes is known as
a. Aphanitic
b. Phaneritic
c. Pegmatitic
d. Porphyritic
e. Vesicular
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13. The holes within an igneous rock, if present, are caused by
a. Small worms burrowing through the rock
b. The contraction of the rock during cooling
c. The expansion and release of hot gases as the rock is cooling
d. Parts of the rock dissolving after it forms
e. None of the above
14. An igneous rock that cools in two stages – a slow stage forming large crystals and then a faster stage
forming very small crystals – is said to have a ______________________ texture.
a. Aphanitic
b. Phaneritic
c. Pegmatitic
d. Porphyritic
e. Vesicular
15. If an igneous rock is described as “felsic”, we are saying that it
a. Has light-colored minerals
b. is likely to have a large percentage of quartz and feldspar
c. is a pyroclastic
d. a and b only are true
e. all of the above are true
16. A large body of granite that forms inside the crust and commonly forms the core of a mountain belt
is called a
a. Batholith
b. Travertine
c. Intrusive igneous rock
d. Volcanic bomb
e. None of the above
17. The process by which sediment settles out of the water or wind carrying it is
a. Compaction
b. Cementation
c. Deposition
d. Erosion
e. Lithification
18. The sedimentary rock breccia is made up of
a. Sand-sized jagged/angular rock particles
b. Gravel-sized jagged/angular rock particles
c. Coal fragments
d. Gravel-sized rounded rock particles
e. Large crystals
19. The process in which dissolved minerals crystallize and “glue” particles of sediment together is
a. Compaction
b. Cementation
c. Deposition
d. Erosion
e. Dissolution
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20. All of the following are clastic rocks EXCEPT
a. Slate
b. Conglomerate
c. Mudstone
d. Sandstone
e. Breccia
21. Coal is an example of a(n) _________________ sedimentary rock.
a. Chemical
b. Organic
c. Clastic
d. Mafic
e. Non-foliated
22. Examples of chemical sedimentary rocks include:
a. Travertine
b. Rock gypsum
c. Rock halite
d. All of the above
e. A and b only
23. Geologists classify metamorphic rocks first according to
a. The range of colors on the surface of the rock
b. The overall shape of the rock
c. The arrangement of grains that make up the rock (pattern)
d. Moh’s hardness scale
e. Felsic vs. mafic
24. The texture of a metamorphic rock that has grains arranged in parallel layers is described as
a. Foliated
b. Phaneritic
c. Nonfoliated
d. Aphanitic
e. Brecciated
25. Metamorphic rocks such as marble and quartzite are said to be __________________ because their
mineral grains are not arranged in parallel layers or bands.
a. Foliated
b. Phaneritic
c. Nonfoliated
d. Aphanitic
e. Brecciated
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26. When large parts of the earth’s crust are squeezed and forced downward into deep areas of high
temperature and pressure, the result is
a. Something really cool
b. Stressful
c. I have no idea – did we cover this?
d. Regional metamorphism
e. Contact metamorphism
27. When a pool of magma intrudes upward into the crust and “scorches” the local rocks, the result is
a. Something else really cool
b. Not so stressful
c. Still can’t think of it
d. Regional metamorphism
e. Contact metamorphism
28. The parent rock of a marble is likely to be a
a. Limestone
b. Sandstone
c. Granite
d. Shale
e. Schist
29. The parent rock of a gneiss is likely to be a
a. Limestone
b. Sandstone
c. Granite
d. Shale
e. Schist
30. The parent rock of a quartzite is likely to be
a. Shale
b. Quartz Sandstone
c. Chert
d. Slate
e. Travertine
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OKAY, NOW YOU CAN WRITE ON THE TEST!!!!
Name: ______________________________________
Period: ______
Part II. Complete the Matching for the following terms and rock types (30 points)
_____ basalt
a. organic sedimentary rock, formed from plant debris
_____ granite
b. chemical sedimentary rock, formed by halite crystals
_____ scoria
c. foliated metamorphic rock, banded light and dark minerals
_____ pumice
d. foliated metamorphic rock, shiny due to abundant mica
_____ obsidian
e. felsic, phaneritic, intrusive igneous rock
_____ diorite
f. mafic, aphanitic, extrusive igneous rock
_____ sandstone
g. clastic sedimentary rock, angular gravel-size particles
_____ travertine
h. foliated metamorphic rock, flat surfaces, used for roofing
_____ rock salt
i. felsic, vesicular, extrusive igneous rock
_____ conglomerate
j. nonfoliated metamorphic rock, white, formerly limestone
_____ breccias
k. chemical sedimentary rock, forms around hot springs
_____ chert
l. intermediate, phaneritic, intrusive igneous rock
_____ coal
m. felsic to intermediate, glassy, extrusive igneous rock
_____ limestone
n. clastic sedimentary rock, sand-size grains
_____ coquina
o. mafic, vesicular, extrusive igneous rock
_____ quartzite
p. nonfoliated metamorphic rock, from quartz sandstone
_____ gneiss
q. clastic sedimentary rock, rounded gravel-size particles
_____ schist
r. organic sedimentary rock, composed of broken shells
_____ slate
s. chemical sedimentary rock, microcrystalline quartz (jasper, flint)
_____ marble
t. chemical/organic sedimentary rock, formed from calcite crystals
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Part III. Short Answer (10 points)
If it helps, these questions are from your 3 rock labs….good luck. You do NOT have to write complete
sentences, but be sure you write enough that your answer is clear and makes sense.
1. Sedimentary rocks may have angular or rounded particles. Why – or how – do some particles become
rounded?
2. How are granite and gneiss similar?
3. Why do schist and phyllite appear to sparkle?
4. True or False: As more heat and pressure are applied to a rock, it will appear less and less foliated.
5. How is granite similar to rhyolite? How is it different?