§6-2 “Metamorphic Rocks”
Objectives:
• Distinguish between regional and contact metamorphism.
• Distinguish between foliated and nonfoliated metamorphic rocks and give an example of each.
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.
Contact Metamorphism
• Magma rises into existing rocks & the heat causes changes in the minerals.
Regional Metamorphism
• Caused by tectonic activity at plate boundaries.
• Friction creates immense heat & pressure which changes the chemical composition of a rock.
Metamorphic Rock Video Clip
Classification of Metamorphic Rocks
Only 2 choices:• Foliate
– Similar to layers
– Also called “banding”
• Nonfoliated– Similar to fracture
Foliated Rocks – show layering or “banding”
Nonfoliated Rocks – Crystals grow as rock heats up
Limestone changes to Sandstone changes to
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
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