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Classifying Rocks Earth and Space Classifying Rocks Background 1. What are the three basic categories of rocks? ____________________________________________________________________________ ____________________________________________________________________________ 2. What characteristic is used to determine the three categories? ____________________________________________________________________________ ____________________________________________________________________________ 3. List each category of rock and describe how it forms. A. ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ B. ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ C. ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ 4. What is the rock cycle? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ 1 Classifying Rocks Earth and Space Part I: The Rock Cycle Sedimentary Rocks: ____________________________________________________________________________ 1. Draw your sedimentary rock model in this space. Answer the following three questions on the lines below about your model rock and the real sedimentary rock sample. What processes were involved in the formation of your model? How is your model similar to the real sedimentary sample? How is your model different from the real sedimentary sample? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ Metamorphic Rocks: 2. Draw your metamorphic rock model in this space. Answer the following three questions on the lines below about your model rock and the real metamorphic rock sample. What processes were involved in the formation of your model? How is your model similar to the real metamorphic sample? How is your model different from the real metamorphic sample? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ Igneous Rocks: 3. Draw your igneous rock model in this space. Answer the following three questions on the lines below about your model rock and the real igneous rock sample. What processes were involved in the formation of your model? How is your model similar to the real igneous sample? How is your model different from the real igneous sample? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ 2 Classifying Rocks Earth and Space Part I: The Rock Cycle, continued The Rock Cycle: 4. You have taken a rock through one pathway of the rock cycle! Use this experience to diagram the pathway you modeled through the rock cycle. Use the terms and process words in the word bank to complete the diagram. Terms Igneous Rock Metamorphic Rock Sedimentary Rock Sediments Magma Processes (Arrows) Weathering, Erosion and Deposition Extreme Heat and Pressure Cooling and Solidifying Melting Compaction and Cementation 3 Classifying Rocks Earth and Space Part II: Igneous Rock Formation 1. What does the liquid or melted crayon represent in this model? _________________________________________________________________________ Draw a diagram to show what occurred as the liquid was poured into the three different glasses in the boxes below. Write a description of the appearance in the space beside the diagram and include how quickly or slowly the wax cooled and hardened. 2. Over Ice ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ 3. In Cold Water ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ 4. In Warm Water ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ 4 Classifying Rocks Earth and Space Part II: Igneous Rock Formation, continued 5. What controls the size of the crystals formed in igneous rocks? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ 6. Use the three following phrases to identify which type of formation is represented by each of the three models. Cooling such as when lava flows over land. Very slow cooling such as what occurs when magma is trapped beneath Earth’s surface. Rapid cooling such as when lava flows into water. Glass with ice: ________________________________________________________________ Glass with cold water: __________________________________________________________ Glass with warm water: _________________________________________________________ 7. Use the descriptions of each model type in question 6 to identify which method of cooling formed the three igneous rock samples of obsidian, granite, and basalt. Obsidian: ___________________________________________________________________ Granite: ____________________________________________________________________ Basalt: _____________________________________________________________________ 8. In what way is this a good model of how igneous rock forms? _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ 9. In what way is this not a good model of how igneous rock forms? _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ 5 Classifying Rocks Earth and Space Reflections and Conclusions 1. What is the effect of temperature in the formation of igneous rocks? ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ 2. What properties did you identify when observing the sedimentary rock? How do these properties relate to the formation of sedimentary rocks? ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ 3. What properties did you identify when observing the metamorphic rock? How do these properties relate to the formation of metamorphic rocks? ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ 4. How is the formation of metamorphic rocks different from that of igneous rocks even though both can take place underground? ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ 6 Classifying Rocks Earth and Space Reflections and Conclusions, continued 5. Make a T-Chart to compare the formation processes of igneous, sedimentary, and metamorphic rocks. 6. Label the action (process) that occurs along the arrows to complete the diagram of the Rock Cycle. Igneous Rock Metamorphic Rock Sedimentary Rock 7