Download Metamorphic Rocks PPT

Bell Work: 10/17/11
Write the answer and explain why the answer you
chose is correct (justify your answer).
What type of rock is most likely formed by process 3?
Objectives

Identify the major processes that drive the rock
cycle (SPI 0707.7.3).




How are metamorphic rocks formed?
How are the composition, heat, and pressure related
to the texture of metamorphic rock?
What is the difference between foliated and
nonfoliated metamorphic rocks?
Label a diagram that depicts the three different
rock types (SPI 0707.7.2).
Metamorphic Cookies
Group Discussion:
• Explain to your elbow partner how the mixture of
raw ingredients in the cookie dough is like
sedimentary rock.
• What does the word “metamorphosis” mean?
• Describe to your elbow partner how cookie
dough metamorphoses when it is baked in an
oven.
• How is baking cookies related to how
metamorphic rocks are formed?
Metamorphic Rocks: Rocks that Change
Metamorphic comes from
the Greek words meta
and morph. Meta means
“change” and morph
means “form”. So we
get metamorphic
meaning to change
form.
Metamorphic Rock:
Origins of Metamorphic
Rock
• Rocks can also go through a process called
metamorphism, which means to
____________.
change form
• Metamorphic
___________ _______
rocks are rocks in which the
structure, texture, or composition of the
rocks have changed.
• All three types of rocks can go through
metamorphism or can be changed by ______,
heat
_________,
pressure or a combination of both.
Metamorphic Rock:
Two Kinds of Metamorphism
Contact
metamorphism
• ___________
________________occurs
when
magma intrudes or forces its way into
existing rock. The heat of the magma bakes
the surrounding rocks causing them to
change.
metamorphism by contrast
• ___________
Regional ________________
takes place over large areas deep within
Earth’s crust. Regional metamorphism is
associated with mountain building.
Metamorphic Rock
Textures of Metamorphic Rocks
Textures of metamorphic rocks
depend on composition of the
rock and the amount of heat and pressure that is
applied to the rock.
• __________
Foliated = mineral grains arranged in bands or
planes (straight lines). Look at pg. 379.
• ____________
Nonfoliated = mineral grains are not arranged in
bands or planes
• Examples of metamorphic rocks:
Gneiss
Marble
Group Activity
• In the T-chart on your notes, categorize
the rock samples as Foliated Metamorphic
Rocks or Nonfoliated Metamorphic Rocks.
• Pay careful attention to how the mineral
grains are arranged in the rocks (bands or
not).
• Write the names of the rocks on the Tchart under the categories.
• Use the cup system during this activity.
Question Challenge:
How could #14, Amphibolite,
be categorized both foliated
and nonfoliated?
Real World Uses of
Metamorphic Rocks
Marble
Slate
3-2-1 Reflection
3 things I learned…
2 questions I have…
1 way I can relate this lesson to my
daily life…