Metamorphic Rocks
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Printed: November 5, 2013
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C ONCEPT
Concept 1. Metamorphic Rocks
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Metamorphic Rocks
Lesson 4.4: True or False
Name___________________ Class______________ Date________
Write true if the statement is true or false if the statement is false.
_____ 1. When rocks undergo metamorphism, they always change chemically.
_____ 2. Extreme pressure during metamorphism always causes rocks to develop layers.
_____ 3. Metamorphism can occur without extreme pressure being applied to rocks.
_____ 4. The metamorphism of shale can result in the metamorphic rock schist.
_____ 5. The metamorphic rock hornfels forms by regional metamorphism.
_____ 6. The parent rock of the metamorphic rock quartzite is limestone.
_____ 7. The metamorphic rock named schist may be used for landscaping.
_____ 8. Some toothpastes contain the metamorphic rock marble.
_____ 9. The metamorphic rock slate may be used as a building material.
_____ 10. The metamorphic rock quartzite is very soft and crumbly.
Lesson 4.4: Critical Reading
Name___________________ Class______________ Date________
Read this passage based on the text and answer the questions that follow.
Metamorphism
Any type of rock—igneous, sedimentary, or metamorphic—can become a metamorphic rock. All that is needed is
enough heat and/or pressure to alter the parent rock’s physical or chemical makeup without melting the rock entirely.
Rocks change during metamorphism because their minerals must be stable under the new temperature and pressure
conditions. The need for stability may cause the structure of minerals to rearrange so new minerals form. Ions may
move between minerals to create minerals with different chemical compositions.
Extreme pressure exerted from one direction only may cause foliation. During this process, layers form in rocks as
they are squeezed by extreme pressure. Examples of foliated metamorphic rocks include slate and schist, both of
which form from the sedimentary rock shale. Metamorphic rocks may also be non-foliated. Quartzite and marble
are nonfoliated metamorphic rocks.
Questions
1. What causes rocks to undergo metamorphism?
2. Why do rocks change during metamorphism?
3. What is foliation? When does it occur?
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Lesson 4.4: Multiple Choice
Name___________________ Class______________ Date________
Circle the letter of the correct choice.
1. What happens during metamorphism?
a.
b.
c.
d.
Rocks change physically or chemically.
Rocks form from magma.
Rocks melt completely.
any of the above
2. Foliation normally occurs when
a.
b.
c.
d.
rock temperature rises to the melting point.
pressure is exerted in just one direction on rock.
layers of rock are peeled away by extreme heat.
layers in rock disappear due to extreme pressure.
3. Regional metamorphism may be caused by
a.
b.
c.
d.
extreme pressure from overlying rock.
burial of rock deep below Earth’s surface.
compression by geologic processes.
all of the above
4. Contact metamorphism occurs
a.
b.
c.
d.
over a wide area.
because of extreme heat.
when rock changes to magma.
because of weathering and erosion.
5. All of the following are non-foliated metamorphic rocks except
a.
b.
c.
d.
schist.
marble.
quartzite.
metaconglomerate.
6. When shale undergoes metamorphism, it may change to
a.
b.
c.
d.
phyllite.
marble.
quartzite.
none of the above
Lesson 4.4: Matching
Name___________________ Class______________ Date________
Match each definition with the correct term.
Definitions
_____ 1. changes in enormous quantities of rock over a wide area
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Concept 1. Metamorphic Rocks
_____ 2. example of foliated metamorphic rock
_____ 3. formation of layers in rock due to pressure form one direction
_____ 4. example of non-foliated metamorphic rock
_____ 5. changes in rock due to heating by nearby magma
Terms
a. gneiss
b. foliation
c. hornfels
d. regional metamorphism
e. contact metamorphism
Lesson 4.4: Fill in the Blank
Name___________________ Class______________ Date________
Fill in the blank with the appropriate term.
1.
2.
3.
4.
5.
__________ occurs when rock changes from one type to another due to extreme heat or pressure.
Slate forms when __________ undergoes metamorphism.
When sandstone undergoes metamorphism, it becomes __________.
Marble is a metamorphic rock that forms from __________.
Rocks change during metamorphism because the __________ must be stable under the higher temperature
and pressure.
6. The rock from which a metamorphic rock forms is called the __________ rock.
Lesson 4.4: Critical Writing
Name___________________ Class______________ Date________
Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences.
Compare and contrast regional and contact metamorphism.
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