Metamorphic Rock Identification
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4Rocks
Metamorphic Rocks
Key Concepts
• How do metamorphic
What do you think?
Read the two statements below and decide
rocks form?
whether you agree or disagree with them. Place an A in the Before column
• How do types of
if you agree with the statement or a D if you disagree. After you’ve read
metamorphic rock differ?
this lesson, reread the statements to see if you have changed your mind.
Before
Statement
After
With the right pressure and temperature
7.
conditions, minerals in a rock can change
shape without breaking or melting.
8.
Metamorphic rocks have layers that form as
minerals melt and then recrystallize.
I dentify Main Ideas Write
Metamorphic Rock Formation
a phrase beside each
Imagine that you left home with a cheese sandwich in your
paragraph to summarize the
backpack. You threw your backpack into your hot locker at
main point of the paragraph.
school. Would the sandwich look the same by lunchtime? The
After you have read the
lesson, review the phrases
cheese would likely be soft because of changes in temperature.
you have written.
Also, your heavy backpack could squish the sandwich. Like the
sandwich, metamorphic rocks are affected by changes in
temperature and pressure. Metamorphism is any process that
affects the structure or composition of a rock in a solid state as a result
of changes in temperature, pressure, or the addition of chemical fluids.
Most metamorphic rocks form far below Earth’s surface.
Deep within Earth’s crust and mantle, temperatures and
pressures are high. Metamorphic rocks, like igneous rocks,
form under high temperature and pressure conditions.
Unlike igneous rocks, metamorphic rocks do not crystallize
Reading Check
from magma.
1. Define
What is
If you compare metamorphic rocks to sedimentary rocks,
metamorphism?
you will notice differences. Sedimentary rocks form on Earth’s
surface, while metamorphic rocks form beneath Earth’s
surface. Erosion and deposition contribute to the formation
of sedimentary rocks. These processes are not part of the
formation of metamorphic rocks.
59
Reading Essentials
Rocks
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