Metamorphic Rocks

Ex: Caterpillar to Butterfly Ex: Granite to Gneiss Metamorphic = to change form Ex: Caterpillar to Butterfly Ex: Granite to Gneiss Granite

How are metamorphic rocks formed? extreme heat and/or pressure

The temperature changes in the rock make it more flexible. The atoms re-arrange

MELTING DOES NOT OCCUR! If melting occurs, it is classified as an Igneous Rock

Where does the Heat Come from? Heat comes from magma from the Earth’s interior.

Where does the Pressure Come From? Pressure comes when tectonic plates converge or squeeze together.

Regional Metamorphism Large geographic area Example: where mountains form

small geographic area Example: Contact Metamorphism when rocks come in contact with magma

Two Classifications for Metamorphic Rock Metamorphic Rocks Nonfoliated & Foliated

Nonfoliated no layers or banding. Example Marble

usually black and white Foliated banding of minerals usually black and white

Distorted Structure folded layers

I hope that after the test we can say this to each other!! Me You