1. Do Now: Answer in your NB Make sure you copy the questions! 1. What are sediments? 2. List and describe the three types of sedimentary rocks. 3. How do sedimentary rocks hold evidence of past life? 4. What are horizontal layers of sedimentary rocks called?

2. What do rocks tell us about the Earth?

3. Metamorphic Rocks  Form when preexisting rocks are exposed to increases in temperature and pressure and to hydrothermal solutions  Rocks do not reach melting point

4. Metamorphic Characteristics  Foliated Rocks Layers or bands of minerals Minerals with needle like crystals form with axes perpendicular to pressure

5. Metamorphic Characteristics  Non Foliated Rocks Metamorphic rocks composed mainly of minerals that form blocky crystal shapes

6. Grades of Metamorphism  Studying metamorphism can help to locate metamorphic minerals (such as Garnet) and interpret metamorphic history Low Grade – Low temp and pressure Intermediate Grade High Grade – High temp and pressure

7. Types of Metamorphism  Regional Metamorphism High temps and pressure affect a large area creating belts Range from high to low grade Changes in rocks and minerals Deforming of rock layers

8. Types of Metamorphism  Contact Metamorphism Igneous intrusion comes in contact with solid rock  Hydrothermal Metamorphism Very hot water reacts with rock and alters its chemical and mineral composition

9. Economic Importance  Construction Marble and Slate  Metallic Resources Metal Ores (Precipitated from hydrothermal solutions)  Non Metallic Resources Talc, graphite