October 5, 2016 Aims: SWBAT describe the formation of metamorphic rocks. SWBAT use the composition of a metamorphic rock to identify the rock and to infer its history of formation. Agenda 1. Do Now 2. Class Notes 3. Guided Practice 4. Independent Practice 5. Practicing our AIMS: Homework: ES.9 Metamorphic Rocks How will you help our class earn all of our S.T.R.I.V.E. Points? 1
Aim Check: What do all metamorphic rocks start as? Describe a foliated rock How does graphite become a diamond? 2
SCIENCE 8 Metamorphic Rocks ES.9 Name: Date: Homeroom: Earth s Surface OBJECTIVES: By the end of class, students will be able to SWBAT describe the formation of metamorphic rocks. SWBAT use the composition of a metamorphic rock to identify the rock and to infer its history of formation. DO NOW Direction: Read and ANNOTATE the information then, list the facts given in the article. Identify each statement as True or False. If the statement is false, correct the underlined word so that it is true. 1. Igneous rocks are formed when sediments are compacted. 2. Fossils are usually found in organic sedimentary rocks. 3. A clastic sedimentary rock is formed when particles precipitate out of the solution. 4. Strata refers to layers of fossils. 5. A chemical sedimentary rock is formed when pieces of rock are cemented together. 6. When sediments are buried under other sediments they form layers called strata. 7. Weathering is when sediments are moved from one location to another. 8. Deposition occurs when sediments are piled on top of each other. 9. Erosion is when rocks are broken down by wind, water, etc. CONCEPT CHECK 3
AN ORIGIN STORY SORTA METAMORPHIC ROCK: CLASS NOTES The word metamorphic comes from the Greek words: Meta = Morphos = A rock s texture or mineral composition can change when its surroundings change. If the of the new environment is different from the one in which it was formed, the rock will undergo metamorphism. CONTACT METAMORPHISM: Minerals in the rock change REGIONAL METAMORPHISM: 4
COMPOSITION OF METAMORPHIC ROCK Metamorphic rocks can be classified by the minerals present. INDEX MINERAL: Index minerals are used to estimate the temperature, depth, and pressure at which a rock underwent metamorphism. 5
TEXTURE OF METAMORPHIC ROCK FOLIATED: NONFOLIATED: Nonfoliated metamorphic rocks are commonly made of one or only a few minerals. During metamorphism, the crystals of these minerals may in a process called. STRUCTURES OF METAMORPHIC ROCK Metamorphic rock has features that indicate its history. These features are caused by deformation. DEFORMATION: These forces may cause a rock to be squeezed or stretched. Folds, or bends, in metamorphic rock are structures that indicate a rock has been deformed. 6
GUIDED PRACTICE Directions: Read and ANNOTATE each question before you solve the problem. Use ICE to support your responses. 1. The mineral graphite forms from extremely high temperatures changing the arrangement of carbon atoms into layers. Identify the type of metamorphism that typically forms graphite (like your pencil lead). 2. Diamonds form from extremely high pressures changing the arrangement of carbon atoms into an interlocking arrangement. Identify the type of metamorphism you would expect to form diamonds. 3. Describe the processes of the rock cycle that would change to graphite (like your pencil lead.) into diamond. 4. Ms. Kramer is tired of sweating and has decided the 8 th grade should spend the year changing graphite into diamonds. She needs to convince Ms. Barrett that changing all of CCA s pencil lead will teach students some of the science they will need for high school and college. If you were Ms. Barrett, would you consider the time and expense worth it? 7
INDEPENDENT PRACTICE Directions: For each key term, explain the big idea to a kindergartener. Then, draw a picture to illustrate the word. Term Concept Picture Metamorphic Rock Contact Metamorphism Regional Metamorphism Foliated Nonfoliated Deformation 8
Directions: Read and ANNOTATE each question before you solve the problem. Directions: Support your selection by finding evidence to support your answer OR evidence to support why another is incorrect. Start your explanation with The evidence shows that Question 1. Metamorphic rocks are created by Supporting evidence A. molten rock cooling B. solutions precipitating C. heat and pressure D. compaction and cementation 2. metamorphism occurs when rocks are heated by nearby magma. A. deformation B. foliated C. regional D. contact 3. When a metamorphic rock s texture is in bands or lines it is classified as. A. strata B. foliated C. nonfoliated D. deformation 4. metamorphism occurs due to extreme pressure caused by convergent plate boundaries A. deformation B. foliated C. regional A. contact 5. A metamorphic rock that does not have bands or lines in its texture is classified as. A. strata B. foliated C. nonfoliated D. deformation 9
Directions: Identify each statement as True or False. If the statement is false, correct the underlined word so that it is true. 1. Igneous rocks are formed when the structure, texture, or composition of a rock is changed. 2. Contact metamorphism occurs when pieces of Earth s crust run into each other. 3. Foliated metamorphism occurs when magma heats rocks nearby. 4. A metamorphic rock that has a lined texture is nonfoliated. 5. Pressure can come from movements in Earth s crust. Directions: Use ICE to support your conclusion. Start with the phrase I can conclude that 1. A metamorphic rock with crystals is found. Classify the type of rock. 2. A metamorphic rock undergoes recrystallization. Predict the new rock s texture. Directions: Use ICE to support your conclusion. Start with the phrase The evidence shows that 3. A metamorphic rock with the index minerals quartz and garnet is found. 4. Ms. Kramer finds a metamorphic rock with feldspar, quartz, and chlorite. What can she infer about how the rock was formed? 10
BEAST MODE: Review! Directions: Read and ANNOTATE each question before you solve the problem. 11
Directions: Select the correct answer for each question. 1. According to the rock cycle diagram, which of the following statements is true? A. Only sedimentary rock gets weathered and eroded. B. Sedimentary rocks are made from metamorphic, igneous, and sedimentary rock fragments and minerals. C. Heat and pressure create igneous rocks. D. Metamorphic rocks are created by melting and cooling. 2. A rock exists at the surface of the Earth. What would be the most likely next step in the rock cycle? A. cooling B. weathering C. melting D. metamorphism 3. Which of the following processes brings rocks to Earth s surface? A. burial B. deposition C. uplift D. weathering 12
4. Which of the following is the best summary of the rock cycle? A. Each type of rock gets melted. Then the magma turns into igneous, sedimentary, and metamorphic rock. B. Magma cools to form igneous rock. Then, the igneous rock becomes sedimentary rock. Sedimentary rock is heated and forms metamorphic rock. Metamorphic rock melts to form magma. C. All three rock types can weather to create sedimentary rock. All three rock types can melt to form magma. Magma forms igneous rock. All three types of rock can form metamorphic rock because of heat and pressure. D. Igneous rock is weathered to create sedimentary rock. Sedimentary rock is melted to form igneous rock. Metamorphic rock is weathered to form igneous rock. 5. In which set are the rock drawings labeled with their correct rock type? A. B. C. D. 13
Directions: Use the Mineral Properties Chart to answer the questions that follow. 1. What is the best way to tell Halite from other minerals? 2. Why is color not a good way to identify quartz? 3. I am a mineral that you can scratch pretty easily. When you rub it on a surface, a white powder comes off, but the color of the mineral is only sometimes white. Which mineral am I? 4. I am a mineral that is different color in regular form and powder form. I never break evenly and I am very shiny. Which mineral am I? 14
Science 8 Name: SKILL SNAPSHOT Date: Homeroom: ES.9: Metamorphic Rocks Quick Notes: Like A Scholar? Yes No Redo? Yes No Read and ANNOTATE each question before you solve the problem. Directions: Support your selection by finding evidence to support your answer OR evidence to support why another is incorrect. Start your explanation with The evidence shows that Question 1. Metamorphism that occurs due to pressure caused by convergent plate boundaries is called Supporting evidence A. foliated B. nonfoliated C. contact D. regional 2. When the texture of a metamorphic rock is banded it is classified as A. foliated B. nonfoliated C. contact D. regional 3. When the texture of a metamorphic rock is banded it is classified as A. foliated B. nonfoliated C. contact D. regional 4. Metamorphism that occurs by being heated by nearby magma is A. foliated B. nonfoliated C. contact D. regional 15
Directions: Read the scenarios below. Classify the type of rock described. Use ICE to support your conclusion. Start with the phrase It is clear that 5. Mr. Flynn and Mr. Manendo are discussing metamorphism. Mr. Flynn claims that only sedimentary rocks can become metamorphic as layers add more and more pressure. Mr. Manendo states that any rock can become metamorphic if the pressure and/or temperature is great enough. Who is more correct? Claim (1/2 pt.) Evidence (1 pt.) Error Free (1/2 pt.) Correct conclusion Relevant Evidence Complete Sentence Punctuation Capitalization Clarity 6. Ms. Rashed is confused by the pictures on page 6 showing metamorphic rocks that are foliated and those that have gone through deformation. Explain the difference in what foliated and deformation tell us about a metamorphic rock. CONCEPT CHECK Claim (1/2 pt.) Evidence (1 pt.) Error Free (1/2 pt.) Correct conclusion Relevant Evidence Complete Sentence Punctuation Capitalization Clarity 16