Transcript Metamorphic Rocks

Metamorphic Rocks
Cornell Notes pg. 135
What are
Metamorphic
Rocks?
• Rocks in which
original structure,
texture, or mineral
composition of the
rock have changed.
• Changes caused by
heat, pressure, or
both.
Think and discuss…
• What kinds of rocks can become
metamorphic rocks?
• What causes rocks to change into
metamorphic rocks?
What is
Contact
Metamorphism?
• Rock is heated
by nearby
magma as
magma moves
through crust.
What is
Regional
• Pressure builds up
Metamorphism? in rock buried deep
below other rocks
or when pieces of
the Earth’s crust
collide.
How do heat
and pressure
change
rocks?
• Composition
– Minerals present in
original rock may be
changed into new
minerals when
temperature or
pressure change.
How do heat
and pressure
change
rocks?
• Texture
–Foliated: mineral
grains are arranged
in bands
• Gneiss
–Nonfoliated: mineral
grains NOT arranged
in bands
• Marble
Foliated Rock
• Pg. 47