1. Metamorphic Rocks

2. Metamorphic rocks form due to increased heat, increased pressure, and hydrothermal solutions – Heat – comes from 2 sources: magma and depth – Pressure – increased depth – Hydrothermal solutions – promotes re-crystallization

3. Types of Metamorphism Contact Metamorphism – exposure to hot magma can cause low-grade metamorphism – Ex: magma flows into limestone rock and turns it into marble Regional Metamorphism – large areas of rock exposed to extreme heat and pressure – Ex: mountain building/convergent boundaries

4. Classifying Metamorphic Rocks The first type of metamorphic rocks are foliated Foliated is when the mineral grains in the rock have been squeezed and flattened into a sheet- like appearance

5. Other types of foliated metamorphic rocks may look like sheets of rocks stacked on top of one another The metamorphic rock Slate

6. The other type of metamorphic rock is nonfoliated Nonfoliated metamorphic rocks have mineral grains that are arranged randomly

7. Making Metamorphic Rocks The sedimentary rock Shale can be metamorphosed into the Metamorphic rock Slate

8. Making Metamorphic Rocks The igneous rock Granite can be metamorphosed into the Metamorphic rock Gneiss

9. Making Metamorphic Rocks The sedimentary rock Limestone can be metamorphosed into the Metamorphic rock Marble