Download 3 Major Rock Groups

I. Metamorphic Rock

Metamorphic
rocks form from
intense heat and
pressure.

These rocks start
out as some other
type of rock, but
have been
substantially
changed from
their original form.
How Do Metamorphic Rocks Form?
II. Origins of Metamorphic Rock
A. Contact Metamorphism
 Rock
undergoes
metamorphism when
it comes in contact
with magma or is
heated by nearby
magma.
II. Origins of Metamorphic Rock
B. Regional Metamorphism

Pressure builds up in rock
that is buried deep
below rock formations or
when large pieces of
rock collide.
III. Textures of Metamorphic Rock
A. Foliated: texture of metamorphic
rock in which the mineral
grains are arranged in planes
or bands.
III. Textures of Metamorphic Rock
B. Nonfoliated:

The texture of
metamorphic rock
in which the mineral
grains are not
arranged in planes
or bands.