LEQ: What are metamorphic rocks, how do they form, and how are they classified?

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LEQ What are metamorphic rocks, how do they
form, and how are they classified?

• Lesson terms foliated, non-foliated.

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Metamorphic Rock

• Every metamorphic rock is a rock that has changed
  its form.
• The word metamorphic comes from the Greek
  language.
• In Greek meta means change.
• In Greek morphosis means form.

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Metamorphic Rock

• Heat and pressure deep beneath Earths surface
  can change any rock into metamorphic rock.
• Sometimes, forces inside the Earth can push the
  rock down toward the heat of the mantle.

http//www.phschool.com/atschool/science_activity_
library/images/earths_interior.jpg
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Metamorphic Rock

• When rock changes into metamorphic rock, its
  appearance, texture, crystal structure and
  mineral content change.
• Metamorphic rock can form out of igneous,
  sedimentary, or other metamorphic rock.

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Metamorphic Rock

• Geologists classify metamorphic rocks by the
  arrangement of the grains that make up the rocks.
• If grains are lined up in parallel layers or
  bands, they are said to be foliated.
• If grains are randomly arranged with no layers,
  or bands, they are said to be non-foliated.

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Foliated Metamorphic Rocks
Slate
Schist
http//www.inspect-ny.com/roof/slate29.jpg
Gneiss
http//farm4.static.flickr.com/3140/2688358095_c96
8a7df0b.jpg?v0
http//www.daviddarling.info/images/quartzite.jpg
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Non-Foliated Metamorphic Rocks
White Marble
Pink Quartzite
http//www.inspect-ny.com/roof/slate29.jpg
http//farm4.static.flickr.com/3140/2688358095_c96
8a7df0b.jpg?v0
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Metamorphic Rock

• Igneous or Metamorphic
• Sedimentary
• Granite Gneiss
• Shale Slate
• Sandstone Quartzite
• Limestone Marble
• Parent Rock.