§6-2 “metamorphic rocks”. objectives: distinguish between regional and contact metamorphism....
TRANSCRIPT
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§6-2 “Metamorphic Rocks”
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Objectives:
• Distinguish between regional and contact metamorphism.
• Distinguish between foliated and nonfoliated metamorphic rocks and give an example of each.
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Metamorphism
• Changing of one type of rock to another by heat & pressure or chemical processes.
• Metamorphic rocks are formed from all 3 types of rocks.
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Contact Metamorphism
• Magma rises into existing rocks & the heat causes changes in the minerals.
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Regional Metamorphism
• Caused by tectonic activity at plate boundaries.
• Friction creates immense heat & pressure which changes the chemical composition of a rock.
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Classification of Metamorphic Rocks
Only 2 choices:• Foliate
– Similar to layers
– Also called “banding”
• Nonfoliated– Similar to fracture
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Foliated Rocks – show layering or “banding”
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Nonfoliated Rocks – Crystals grow as rock heats up
Limestone changes to Sandstone changes to
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Assignments• Finish worksheet packet & have checked off.
• Look at metamorphic rocks in boxes.
• Go over worksheets Wednesday
• Test on Thursday in Computer Lab.– Field trip people test on paper Friday in class– Everyone else ch 12 vocab on Friday in class
• STUDY – STUDY --- STUDY
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Page 191 –Blue Box #1
• If you were to start a rock collection, what 10 rocks would you like to include & why.
• EXAMPLE: Moon Rock – because they are rare and I was born when the first astronauts landed on the moon
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