2. Chapter 5 Section 1 Page 146- 149

4. A. When studying a rock sample, geologists classify rocks by: 1. Color 2. Texture 3. Mineral composition 4. Origin

5. B. Most rocks are made up of particles of minerals or other rocks, called grains C. A rock's texture is the grains’ 1. size 2. shape 3. pattern

7. In identifying rocks, geologists also use some of the tests that are used to identify minerals I hope you remember the 8 ways geologists identify minerals!

8. D. There are three major groups of rocks: 1. Igneous rock 2. Sedimentary rock 3. Metamorphic rock Very Important! Pay Attention! Rocks are classified by the way they are formed!

9. Igneous rock forms from the cooling of molten rock—either magma below the surface or lava at the surface

10. Sedimentary rock forms when particles of other rocks or the remains of plants and animals are pressed and cemented together. Sedimentary rock forms in layers.

11. Metamorphic rock is formed when an existing rock is changed by heat, pressure, or chemical reactions. Most metamorphic rock forms deep underground. Schist Gneiss