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Bell Work: 9/18/15 Write the question & answer. Explain why the answer you chose is correct (justify your answer). Objectives Sedimentary Rocks Identify the major processes that drive the rock cycle. How are sedimentary rocks formed? Compare and contrast the three main categories of sedimentary rock. Describe the different features or structures of sedimentary rock. The Rock Cycle Three types of Rock Foldable Sedimentary Rock • --Wind, Water, Ice, Sunlight and Gravity all cause rock to weather into fragments. --Erosion moves these fragments or sediment from one place to another. • --Eventually the sediment are deposited over older layers. • ---Layers become compacted and cemented by dissolved minerals that form a natural cement. Examples of Sedimentary Rock See pages 372-375 for more pictures Three types of Sedimentary Rock 1. Clastic Sedimentary Rock-made of fragments of rocks cemented together by a mineral such as calcite or quartz Examples Sandstone Siltstone Shale Three types of Sedimentary Rock 2. Chemical Sedimentary Rock-forms from solutions of dissolved minerals and water. Example: Halite 3. Organic Sedimentary Rock-forms from fossils Example: Limestone and Coal Sedimentary Rock Structures Stratification- process in which sedimentary rocks are arranged in layers Ripple marks-records of the motion of wind or water waves Mud cracks-when fine-grained sediments at the bottom of shallow water are exposed to air and dry out. Sedimentary Rock in a Jar Sedimentary rocks are composed of different layers. These layers can be pebbles, sand, soil, or fossil fragments. 1. Write a statement, predicting what will happen when we shake the jar. Explain why this will happen. 2. Shake the jar carefully. 3. Describe what happened before, during, and after shaking the jar. 2 minute Journal Relate the Sedimentary Rock in a Jar activity to how real sedimentary rocks are formed. Explain how the activity showed how sedimentary rocks are formed.