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Sedimentary Rocks Objectives • Explain how sedimentary rocks are formed • Describe why we find fossils in sedimentary rock Key Words • Weathering • Sediments • Transported • deposit Competition • • • • Rock paper scissors Can anything change rock?? What shapes a rock? Look at some samples Starter • Draw a spider diagram of what causes weathering Sedimentary Rock Sedimentation Compaction Cementation • Examples: chalk, limestone, sandstone and shale How do Sedimentary Rocks Form? 1. Rocks can crumble to make small particles. 2. The particles are carried away by rivers or wind. 3. The particles settle in another place they form a layer. 4. Other layers are put on top of them. 5. The lower layers get pressed together. 6. Water is squeezed out. The minerals left in the sedimentact like cement 7. The pressure and the mineral cement stick the particles together. 8. The solid rock forms slowly. Activity • Cut and stick in order how sedimentary rock is formed How fossils form Organism Dies Buried Quickly Minerals seep into the bones. The bones rot away leaving rock like minerals in their place