I. FORMATION OF METAMORPHIC ROCKS:
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I. FORMATION OF
METAMORPHIC ROCKS:
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A metamorphic rock is one
whoseoriginal form
hasbeen __________
changed
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BY________ AND
_____________
HEAT
PRESSURE
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THIS ALTERATION IS
CALLED _____________ RE-CRYSTALLIZATION
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These changes are NOT caused
by MELTING
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If the rock melted and
cooled it would be an
_____________ IGNEOUS ROCK
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1. Changes caused by
_____________ RE-CRYSTALLIZATION(again)
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May include the creation
and growth of________________
________ NEW MINERAL CRYSTALS
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2. Rocks which are
intensely __________ can also become ____________ rock
Compressed
metamorphic
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MAKING IT MORE DENSE
AND RESISTANT TO WEATHERING
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The growth of new minerals may cause the rock to appear
BANDED
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OR
STRIPES OF LIGHTDARK
MINERALS
foliated
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pressure
pressure
pressure
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SCHIST SHOWS BANDING
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It can also ____________(BEND) OR
______________ORIGINAL
STRUCTURES
DESTROY
DISTORT
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3. There are two types of
Metamorphism:A.B.RegionalContact
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A.Regional metamorphism: occurs over large areas with extreme pressures &
temperatures
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Photograph of regional metamorphism New York State
thruway
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This extreme heat and
pressure is what builds
MOUNTAINS
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B. CONTACT METAMORPHISM
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IS THE _________ OFCONTACT WHERE ANIGNEOUS INTRUSION MEETS THEEXISTING ROCKBUT _____________MELT IT
ZONE
DOES NOT
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IGNEOUSINTRUSION
Contact metamorphismoccurs only at the placewhere the magma contacts rock
SANDSTONE
LIMESTONE
SANDSTONE
SHALE
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Any kind of rock:
IGNEOUSSEDIMENTARYMETAMORPHIC
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CAN UNDERGORE-CRYSTALLIZATION
TO FORM METAMORPHIC
ROCK.
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PARENT ROCKIs rock from
which metamorphic rock is formed.
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Limestonemetamorphoses to become_________________
marble
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Sandstonemetamorphoses to become_________________
quartzite
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Shalemetamorphoses to become_________________
slate
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Granitemetamorphoses to become_________________
gneiss
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We will not find fossils in Metamorphic rock because:
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All traces of fossils have
been recrystallized
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TIME TO WORK ON THE LAB