Metamorphic Rock
Metamorphic Rock
 “________” is
ancient Greek for
change.
 “Morphosis” is
ancient Greek for
________.
 Metamorphic rock
then is rock that
has _________ from
one form to
another.
Origins of Metamorphic Rock
 Metamorphic rocks are rocks in which the structure,
texture, or composition of the rock have changed.
All three types of rock can be changed by _______,
___________, or a combination of both.

A rock’s texture or mineral composition can change
when its surroundings change. If the temperature or
pressure of the new environment is __________ from
the one in which the rock formed, the rock will
undergo _____________.
Erosion
 Contact Metamorphism When magma moves through the
crust, the ________ heats the surrounding rock and
changes it.
 Some minerals in the surrounding rock are changed
into other minerals by this increase in ____________.
 The greatest change occurs where magma comes into
_________ contact with the surrounding rock.
Regional Metamorphism
 Regional metamorphism occurs when pressure builds
up in rock that is buried deep below other rock
formations, or when large pieces of the Earth’s
crust ___________ with each other.

The increased pressure and temperature causes
rock to become __________ and chemically changed.
How Metamorphic
Rocks Form
 Deep below the
Earth’s surface the
intense heat and
pressure can
_________ rocks.
 Their ____________,
texture, crystal
structure and
mineral content can
change.
Almost Melted!
 Metamorphic rocks are
often __________, smeared
out, and __________.
 Despite these
uncomfortable conditions,
metamorphic rocks do not
get hot enough to melt,
or they would become
__________ rocks!
 Fossils will be
__________.
Classifying
 Classified by the
arrangement of the
grains.
 Foliated
 Non-foliated
 Usually ______ and
________ than the rock
they come from.
Texture of Metamorphic Rock
 All metamorphic rock has one
of two ________.


___________ Metamorphic Rock
_____________ Metamorphic
Rock
Foliated Metamorphic
Rock
 Grains are in
________ layers or
bands.
 “________” is the
Latin word for leaf.
 Describes the _______
layering found in
many metamorphic
rocks.
 These rocks will
split along these
_______.

Slate
 Formed when shale is subjected
to pressure.
 Denser, more _________ than
shale.
 Produces flat plates when
broken.
Slate to Schist
 If slate is
subjected to even
greater pressure
and moderate
temperatures,
_________ is
formed.
Granite
to Gneiss
 Granite
becomes
gneiss when
subjected to
_____ and
_________.
 The atoms
end up
Non-foliated Rock
lining up in
bands.
 Mineral grains are ___________.
 Amorphous

 Do not split into _________.
 Usually smoother and denser than the parent
rock.
Quartzite
 Occurs when
sandstone is
compressed by
____________.
 Usually very
hard.
Marble
 Formed from
_______________
limestone.
 Much harder and
denser.
Key Idea!
 Heat +
pressure =
____________
rock