Metamorphic Rocks

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Metamorphic Rocks
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• Metamorphic to change form
• Ex Caterpillar to Butterfly
• Ex Granite to Gneiss

Granite
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How are metamorphic rocks formed?
extreme heat and/or pressure
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• The temperature changes in the rock make it more
  flexible.
• The atoms re-arrange

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MELTING DOES NOT OCCUR!
If melting occurs, it is classified as an
Igneous Rock
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Where does the Heat Come from?

• Heat comes from magma from the Earths interior.

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Where does the Pressure Come From?

• Pressure comes when tectonic plates converge or
  squeeze together.

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Regional Metamorphism
Large geographic area
Example where mountains form
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Contact Metamorphism
small geographic area
Example when rocks come in contact with magma
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Two Classifications for Metamorphic Rock
Two Classifications for Metamorphic Rocks
Nonfoliated Foliated
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• Nonfoliated
• no layers or banding.
• Example Marble

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Foliated
banding of minerals
usually black and white
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Distorted Structure
folded layers
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I hope that after the test we can say this to
each other!!
Me
You