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Bell Work: 10/20/14Write 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?
Grade Rock Cycle Worksheet
1. Sedimentary2. Igneous3. Sedimentary4. Igneous5. Metamorphic6. Sedimentary7. Metamorphic8. Metamorphic9. Sedimentary10.Igneous
Objectives
25. Metamorphic Rock Notes 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 StarburstsGroup Discussion:
• Rip your Starburst in half and share it with someone in your group who has a different color Starburst.
• Stick the two pieces together and wrap them back up in your Starburst wrapper.
• Explain to your elbow partner how the individual pieces of starbursts stuck together are like sedimentary rock.
• What does the word “metamorphosis” mean?
• We will look at more questions towards the end of class…
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 MetamorphicRock
• Rocks can also go through a process called metamorphism, which means to ____________.
• ___________ _______ 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 ______, _________, or a combination of both.
change form
rocksMetamorphic
heatpressure
Metamorphic Rock:Two Kinds of 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.
• ___________ ________________ by contrast takes place over large areas deep within Earth’s crust. Regional metamorphism is associated with mountain building.
Contact metamorphism
Regional metamorphism
Metamorphic RockTextures 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.
• __________ = mineral grains arranged in bands or planes (straight lines). Look at pg. 379.
• ____________ = mineral grains are not arranged in bands or planes
• Examples of metamorphic rocks:
Foliated
Nonfoliated
Marble
Gneiss
Rock Classification• In the T-chart on your notes, lets 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 T-chart under the categories.
Metamorphic Starbursts
Group Discussion:
• Describe how your starburst metamorphoses when heat and pressure are applied to them.
• How is this starburst activity related to metamorphic rock?