Let’s Rock!

1. The Rock Cycle Let’s Rock!

2. Rocks are mixtures of minerals. There are 3 main types of rocks. Scientists classify rocks according to how they are formed. Rocks

3. Igneous Rocks are formed from cooled magma or lava. They usually have large or small crystals that you can see. Some igneous rocks have holes made by gasbubbles. Types of Rocks

4. Sedimentary Rocks are formed when bits of rock, shells, and the remains of plants and animals are pressed and cemented together. These usually have flat layers you can see. Some contain fossils. They are usually softer than igneous or metamorphic rocks. Types of rocks

5. Metamorphic Rocks are formed from existing rocks that have been squeezed and heated deep inside Earth’s crust. Some have layers that look like dark and light bands. They will break along the bands. Types of rocks

6. *Not all rocks can be indentified using this key Key to rock identification

7. Rocks can change into other kinds of rocks. We call this process the rock cycle. • There are 5 stages in the rock cycle. • Melting • Cooling and Hardening • Weathering and Erosion • Squeezing and Cementing • Squeezing and Heating The Rock Cycle

8. Deep below Earth’s surface, all three kinds of rock are melted to form magma. Rock Cycle Diagram Melting

9. On or below Earth’s surface, magma cools and hardens to form igneous rock. Rock Cycle Diagram Cooling and hardening

10. Weathering breaks existing rock into tiny particles, forming sediment. Erosion moves the sediment to other places, where it is deposited. Rock Cycle Diagram Weathering and Erosion

11. The sediment is squeezed together and cemented to form sedimentary rock. Rock Cycle Diagram Squeezing and cementing

12. Heat and pressure change sedimentary rock and igneous rock into metamorphic rock. Rock Cycle Diagram Watch the Rock Cycle Study Jam Squeezing and heating