Metamorphic Rocks

What are Metamorphic Rocks?

• Metamorphic rocks are rocks that

go through a change or a

metamorphosis.

• Metamorphic Rocks- are changed

as a result of exposure to intense

heat and/or pressure.

Types of Metamorphism

• Metamorphism- the change that

occurs to form metamorphic rocks.

• Two types of metamorphism:

• Contact Metamorphism

• Regional Metamorphism

Contact Metamorphism

• Contact Metamorphism- rocks

come in contact with intense heat.

• When a rock is burned by magma

or lava, the rock changes by the

heat.

Regional Metamorphism

• Regional Metamorphism- rocks

come in contact with intense

pressure.

• When plates collide, the rocks

along that boundary get a lot of

pressure and change.

Example of Metamorphism

• Rocks can constantly change depending on how much heat a pressure they receive.

• Example:

• Shale can become:

• Slate

• Phyllite

• Schist

• Gneiss

Metamorphic Rock Textures

• Foliated

• Have a layered or banded appearance

• Examples: gneiss, phyllite, schist, slate.

• Nonfoliated

• Do not have a layered or banded

appearance.

• Examples: marble and quartzite.

Foliated

Nonfoliated

Classifying Metamorphic Rocks

• Metamorphic rocks vary depending on the region it was found and its composition.

• To identify a metamorphic rock, you classify it based on similarities.

• Texture

• Foliated or nonfoliated

• Composition

• What rocks is it made from.

Watch this Using Your Graphic Organizer

https://www.youtube.com/watch?v=1oQ1J0w3x0o