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Lesson 3 | Changing Earth’s Surface Student Labs and Activities Page Appropriate For: Launch Lab 47 all students Content Vocabulary 48 all students Lesson Outline 49 all students MiniLab 51 all students Content Practice A 52 Content Practice B 53 School to Home 54 Key Concept Builders 55 Enrichment 59 Challenge 60 Lab A 63 Lab B 66 Lab C 69 Chapter Key Concepts Builder 70 all students all students Assessment Lesson Quiz A 61 Lesson Quiz B 62 Chapter Test A 71 Chapter Test B 74 Chapter Test C 77 Approaching Level On Level Beyond Level Teacher evaluation will determine which activities to use or modify to meet any 46 English-Language Learner student’s proficiency level. Earth’s Dynamic Surface Name Date Launch Lab Class LESSON 3: 15 minutes How do rocks change? Weathering is any natural process that changes a rock. The processes can be physical or chemical. How can you tell the difference between physical and chemical weathering? Procedure 1. Read and complete a lab safety form. 2. Use a graduated cylinder to pour 100 mL of water into a beaker. Use a wax pencil to mark this beaker with a W. 3. Pour 100 mL of vinegar into a second beaker. Mark this beaker with a V. crush one half. Put the crushed chalk on a piece of paper. Repeat for the other piece of chalk. 5. At the same time, add the crushed chalk to each beaker. In the Data and Observations section below, describe what happens. 4. Break a piece of chalk into two equal pieces. Use a mortar and pestle to Data and Observations Think About This 1. When did physical weathering take place? When did chemical weathering take place? Explain. 2. Key Concept What do you think is the difference between physical and chemical weathering? Earth’s Dynamic Surface 47 Name Date Class Content Vocabulary LESSON 3 Changing Earth’s Surface Directions: On the line before each definition, write the letter of the term that matches it correctly. 1. large mass of ice, formed by snow accumulation on land, that moves slowly across Earth’s surface 2. process of breaking down rock without changing the composition of the rock 3. triangular deposit of sediment that forms where stream enters a large body of water 4. mechanical and chemical processes that change Earth’s surface 5. process that changes the composition of rocks 6. series of actions or operations that lead to an end result 7. moving of weathered material, or sediment, from A. chemical weathering B. delta C. deposition D. erosion E. glacier F. mass wasting G. physical weathering H. processes I. sediment J. weathering one location to another 8. material formed from rocks broken down by weathering 9. downhill movement of a large mass of rocks or soil due to gravity 10. laying down or settling of eroded material 48 Earth’s Dynamic Surface Name Date Class Lesson Outline LESSON 3 Changing Earth’s Surface A. Breaking Down Earth Materials 1. Processes that wear away and break down are often so slow that it is difficult to see changes in the mountains during a human’s lifetime. a. The mechanical and chemical processes that change Earth’s surface over time are referred to as . b. The material formed from rocks broken down by weathering is . c. Sediment produced by weathering can be rock fragments, sand, silt, or . 2. The process of breaking down rock without changing the composition of the rock is called weathering. a. Rocks can break as a result of motion or when a boulder rolls off a cliff. b. seeping into cracks in rocks can freeze and shatter the rock. c. The force from plant growing in cracks in rocks can pry the rock open. 3. The process that changes the composition of rocks is called weathering. a. Some minerals, such as calcite, can dissolve in slightly water, such as rainwater. b. Other minerals react with carbon dioxide or oxygen in the to form new . c. Abundant water and higher temperatures speed up weathering. B. Moving Earth Materials 1. The term is used to describe the moving of weathered material, or sediment, from one location to another. 2. The laying down or settling of eroded material is Earth’s Dynamic Surface . 49 Name Date Class Lesson Outline continued 3. The downhill movement of a large mass of rocks or soil due to gravity is called . a. On tall mountains or steep slopes, the force of gravity can create a type of mass wasting called a(n) . b. The needed to move rocks and soil can come from gravity, flowing water, wind, and moving . 4. Most erosion and of sediment is carried out by flowing water. a. Faster water can carry larger pieces of than slower water. b. When water slows, the sediment in the water is on the sides of the river. c. When rivers enter oceans or lakes, sediment also is deposited, forming land features called . 5. Erosion by can be the most important process that changes landforms in deserts. 6. Examples of landforms made by wind include dunes and ripples. C. Ice 1. In cold climates, such as high mountains or near the poles, large masses of ice, formed by snow accumulation on land, that move slowly across Earth’s surface are called . a. The force of causes glaciers to flow and slide downhill, weathering the rocks over which the ice moves. b. Glaciers can pick up they and then deposit it when . 2. Plate tectonics explains many of surface features and the processes that occur on it. 3. , or the average weather in a region over a long period of time, affects the processes that move Earth material. 50 Earth’s Dynamic Surface Name Date MiniLab Class LESSON 3: 15 minutes How can wind change Earth’s surface? Wind changes Earth’s surface in different ways. How can you demonstrate how wind can change the land? Procedure 1. Read and complete a lab safety form. 2. Pour dry sand into a clear plastic box. Place two or three large pebbles and small clumps of grass on the surface of the sand. 3. Place the box into a cardboard box that is open on one side. 4. Plug in the hair dryer. Hold the hair dryer about 10 cm from the edge of the box at a 45° angle relative to the plastic box. 5. Turn the dryer on low. Hold it in the same position for 2–3 min. Record your observations in the Data and Observations section below. Data and Observations Analyze and Conclude 1. Observe How did the hair dryer—the wind model—change the sand? Be specific in your answer. 2. Key Concept How does wind change Earth’s surface? Earth’s Dynamic Surface 51 Name Date Class Content Practice A LESSON 3 Changing Earth’s Surface Directions: On each line, write the term from the word bank that correctly replaces the underlined words in each statement. Each term is used only once. chemical weathering mass wasting deposition physical weathering erosion sediment glacier weathering 1. The mechanical and chemical processes that change Earth’s surface over time can affect rocks in different ways. 2. The material formed from rocks broken down by weathering can be rock fragments, sand, silt, or clay. 3. The process of breaking down rock without changing the composition of the rock can occur when water repeatedly freezes and thaws in cracks in rocks. 4. The process that changes the composition of rocks can occur when minerals react with air and water to form new minerals. 5. The moving of weathered materials, or sediment, from one location to another changes the surface of Earth. 6. The laying down or settling of eroded material occurs when flowing water loses energy. 7. Landslides are a type of downhill movement of a large mass of rocks or soil due to gravity. 8. Gravity can cause a large mass of ice, formed by snow accumulation on land, that moves slowly across Earth’s surface to flow and slide downhill. 52 Earth’s Dynamic Surface Name Date Class Content Practice B LESSON 3 Changing Earth’s Surface Directions: Answer each question or respond to each statement in the space provided. Question Answer 1. What does weathering do to rocks? 2. What is sediment? 3. Which kind of weathering does not change the composition of a rock? 4. Which kind of weathering changes the composition of a rock? 5. Compare erosion and deposition. 6. What is mass wasting? 7. Name four things that cause erosion and deposition. 8. Explain how a delta forms. Earth’s Dynamic Surface 53 Name Date Class School to Home LESSON 3 Changing Earth’s Surface Directions: Use your textbook to complete the graphic organizer below by adding descriptions for each item. Some boxes will require more than one description. Gravity Water Agents and Processes That Change Earth’s Surface Wind 54 Glaciers Earth’s Dynamic Surface Name Date Class Key Concept Builder LESSON 3 Changing Earth’s Surface Key Concept What is the difference between physical and chemical weathering? Directions: Complete the concept map with the correct term or phrase from the word bank in the space provided. Each term or phrase is used only once. breaks down rock without changing the composition physical weathering changes the composition of rock rusting Types of Weathering Chemical weathering freezing and thawing Earth’s Dynamic Surface 55 Name Date Key Concept Builder Class LESSON 3 Changing Earth’s Surface Key Concept What is the difference between physical and chemical weathering? Directions: On the line before each description, write P if the description is an example of physical weathering or C if the description is an example of chemical weathering. 1. Calcite in limestone dissolves in slightly acidic rainwater. 2. The roots of plants grow into the cracks in rocks. 3. A boulder rolls off a cliff and breaks apart. 4. Iron in rocks reacts with oxygen to form iron oxide. 5. Carbon dioxide reacts with feldspar to form clay. 6. Water seeps into cracks in rocks and freezes and thaws. 7. Faults rupture and cause rocks to break. Directions: Answer each question or respond to each statement on the lines provided. 8. What is weathering? 9. Compare physical weathering and chemical weathering. 10. Give an example of a factor that can affect rates of weathering. 56 Earth’s Dynamic Surface Name Date Key Concept Builder Class LESSON 3 Changing Earth’s Surface Key Concept How do water, ice, and wind change Earth’s surface? Directions: On the line before each statement, write T if the statement is true or F if the statement is false. If the statement is false, change the underlined word(s) to make it true. Write your changes on the lines provided. 1. Landslides and other types of mass wasting are caused by gravity. 2. Most erosion and transport of sediment occurs by wind. 3. The slower water flows, the larger the pieces of sediment it can carry. 4. In deserts, erosion by water can be the most important process that changes landforms. 5. Ripples are examples of landforms made by wind. 6. Glaciers typically form in cold climates, such as high mountains or near the poles. 7. When a glacier freezes, it deposits the sediments that it carried. 8. Much of North America was covered by flowing water 20,000 years ago. 9. Climate, or the average weather in a region over a long period of time, can affect the processes that change Earth’s surface. Earth’s Dynamic Surface 57 Name Date Class Key Concept Builder LESSON 3 Changing Earth’s Surface Key Concept How do water, ice, and wind change Earth’s surface? Directions: Complete the chart with the correct term from the word bank in the space provided. Some terms may be used more than once. gravity ice water wind Effect Cause 1. landslide 2. Grand Canyon 3. Niagara Falls 4. delta 5. sand dune 6. ripples 7. deep valleys and Directions: Answer each question or respond to each statement on the lines provided. 8. How are plate tectonics related to Earth’s surface features? 9. Give an example of how climate can affect the processes that move Earth material. 10. Give an example of how plate movement can affect climate. 58 Earth’s Dynamic Surface Name Date Class Enrichment LESSON 3 Rocks and Time Ayers Rock in central Australia and the Grand Canyon in the western United States are two of many ancient rock formations that have been shaped over time by deposition, weathering, and erosion. They are special in the geologic sense for the stories that they tell about Earth’s history. subjected to massive forces that folded the layers and tilted the fan of hardened sand 90 degrees, so that the layers of sandstone almost stood on end. Over the last 300 million years, the softer rocks of the basin have eroded away, leaving the parts of the old fans exposed. Uluru: Ayers Rock The Grand Canyon Ayers Rock is the most commonly used name for the formation called “Uluru,” its aboriginal and official name. Uluru is located in the middle of Australia, surrounded by an empty plain. It is composed of arkose, a type of sandstone, and is the tip of a huge slab of rock that extends below the ground for possibly 5 to 6 km—no one really knows how far. The presence of arkose sandstone in the formation is believed to be the result of the rapid erosion of granites from the ancestors of mountain ranges to the south. This arkose is one of many sedimentary formations filling the Amadeus Basin of Australia. Rainwater flowing down the mountains eroded sand and rock and dropped it in big fan shapes on the surrounding plain. Later, the whole area became covered by the sea. Sand and mud fell to the bottom and covered the seabed; then its weight turned both it and the fans into rock. Later, the sea disappeared and all of Central Australia was The Grand Canyon is a steep-sided gorge eroded by the Colorado River in the western United States. It is known for its overwhelming size and complex and colorful landscape. It is geologically significant because of the thick sequence of ancient rocks that are exposed in the walls of the canyon. These rock layers record much of the early geologic history of the North American continent. Many of the formations were deposited in shallow seas and swamps as the sea repeatedly advanced and retreated over the continent. When later uplifts during mountainbuilding events moved the sediments thousands of feet upward, the stream gradient of the Colorado River was steepened and the river’s speed and ability to cut through rock was increased. Erosion is still shaping the canyon, and the different rock layers respond to it in different ways: some form slopes, some form cliffs, and some erode more quickly than others. Applying Critical-Thinking Skills Directions: Respond to each statement. 1. Explain how we know that the rocks formed from the seafloor sediments deposited in the Amadeus Basin were softer than the arkose sandstone. 2. Analyze the following statement about the Grand Canyon: “The story that the rock layers tell is far older than the canyon itself.” Explain why you agree or disagree. Earth’s Dynamic Surface 59 Name Date Class Challenge LESSON 3 Earth Processes at Uluru and the Grand Canyon Over time, the Earth processes of weathering, erosion, and deposition have shaped the Uluru and Grand Canyon formations by acting in similar ways but producing different results. Compare the Histories of Uluru and the Grand Canyon 1. Research photos of Uluru and the Grand Canyon and make copies or sketches of each of the formations. 2. Using the images and research about their geologic histories, structures, and erosional dynamics, compare the history of the Earth processes that shaped each of the formations. Present your research in one of the following formats: • an illustrated time line • a photo or video journal • a magazine article • a TV field report • a detailed diagram • a 3-D model 3. Share your product with other groups in your class. 60 Earth’s Dynamic Surface Name Date Lesson Quiz A Class LESSON 3 Changing Earth’s Surface Matching Directions: On the line before each definition or description, write the letter of the term that matches it correctly. Each term is used only once. 1. Rust is an example of this type of weathering. A. chemical 2. downhill movement of material due to gravity B. deposition 3. the movement of sediment from place to place C. erosion 4. freezing and thawing is this type of weathering D. mass wasting 5. the laying down of sediment in a new place E. physical Multiple Choice Directions: On the line before each question or statement, write the letter of the correct answer. 6. Plant roots often cause A. deltas to form. B. deposition of soil. C. weathering of rocks. 7. Chemical weathering occurs fastest in a A. cold, wet B. warm, dry C. warm, wet climate. 8. Which statement is true? A. Winds deposit large rocks when they blow at high speeds. B. Rivers erode more material on steep slopes than on flat lands. C. Glaciers cause chemical weathering when they freeze and thaw. 9. Which geologic features are examples of deposition by water? A. deltas B. sand dunes C. river valleys Earth’s Dynamic Surface 61 Name Date Class Lesson Quiz B LESSON 3 Changing Earth’s Surface Multiple Choice Directions: On the line before each statement, write the letter of the correct answer. 1. Chemical weathering occurs slowest A. in a desert. B. on a forest floor. C. on the floor of a river valley. D. in a shallow part of the ocean. 2. Deposition does NOT occur A. as a glacier melts. B. during a windstorm. C. when a river empties into the ocean. D. as rocks move downhill due to gravity. 3. are NOT examples of erosion. A. Sand dunes B. River valleys C. Ripple marks D. Glacial valleys Completion Directions: On each line, write a term or phrase that correctly completes each sentence. 4. Rust is an example of weathering. 5. Mass wasting can be defined as . 6. Erosion can be defined as . 7. Deposition can be defined as . 8. Plant roots breaking rocks is a type of 62 weathering. Earth’s Dynamic Surface Name Date Lab A Class 2–3 class periods Earth’s Changing Surface Your teacher just opened a travel agency and has hired all of the students in your class as tour guides. Unlike a typical travel agency, Teacher’s Trusty Travel Tours offers tours to any part of the lower 48 states to explain how the region formed and continues to change. You will be a Trusty Travel Guide for one of these regions. As the expert, you will • develop a travel slogan for your region; • explain how the region formed and continues to change; • make a travel brochure to persuade tourists that your region is the best place in the lower 48 states to visit. Question Find out which region will be your tour-guide territory. What Earth processes do you think might have produced this region? How do you think Earth processes continue to change the region? What information about your region will be most interesting and persuade tourists to choose your area to visit? Materials glue stick colored pencils scissors outline map of the United States physiographic map of United States Also needed: large paper 11 × 18 Safety Procedure 1. A physiographic region is an area with certain relief, or elevation; specific rock types; and specific geologic structures. You will work with an online, interactive physiographic map of the United States. Obtain the Web address for the map from your teacher. 2. Locate your region on the physiographic map. Use a colored pencil to mark its location on the outline map of the lower 48 states. You may use the outline map in your travel brochure. Earth’s Dynamic Surface 63 Name Date Class Lab A continued 3. Research to find photographs of your region. Study the photographs carefully, keeping in mind what you have learned in this chapter about the processes that change Earth’s surface. Based on your observations, explain how you think your region formed. 4. Research your region and record your findings below. Use at least two references to obtain data about your region. Your data can include the geologic history of the region, landforms characteristic of the region, diagrams showing how the landforms formed, and any other information you find interesting. 5. Use the information you have gathered to make your travel brochure. Include the following: • a map of your region, • the region’s name, • your travel slogan, • two or more paragraphs describing the processes that formed and that continue to change the region, and • several photographs and/or drawings of the region. Lab Tips • Remember to rewrite any information you find in books or on the Internet in your own words. • When using the Internet, make sure the information is from a reliable source, such as a college or a university, an online encyclopedia, or a government agency. • Your brochure must serve two purposes. It must be informative, yet easy to understand. It also must persuade people to visit that region of the country. 64 Earth’s Dynamic Surface Name Date Class Lab A continued Analyze and Conclude 6. Research Information How did your research compare to how you thought your region formed? 7. Classify the major Earth processes that produced your region as well as the processes that continue to change it. 8. The Big Idea How do the motion of tectonic plates and the processes of weathering, erosion, and deposition change Earth’s surface? Communicate Your Results Use your travel brochure to put together a 1-minute speech about your region and why people should come to visit it. Practice your speech. Be prepared to answer any questions potential tourists might have! Earth’s Dynamic Surface 65 Name Date Lab B Class 2–3 class periods Earth’s Changing Surface Your teacher just opened a travel agency and has hired all of the students in your class as tour guides. Unlike a typical travel agency, Teacher’s Trusty Travel Tours offers tours to any part of the lower 48 states to explain how the region formed and continues to change. You will be a Trusty Travel Guide for one of these regions. As the expert, you will • develop a travel slogan for your region; • explain how the region formed and continues to change; • make a travel brochure to persuade tourists that your region is the best place in the lower 48 states to visit. Question Find out which region will be your tour-guide territory. What Earth processes do you think might have produced this region? How do you think Earth processes continue to change the region? What information about your region will be most interesting and persuade tourists to choose your area to visit? Materials glue stick colored pencils scissors outline map of the United States physiographic map of United States Also needed: large paper 11 × 18 Safety Procedure 1. A physiographic region is an area with certain relief, or elevation; specific rock types; and specific geologic structures. You will work with an online, interactive physiographic map of the United States. Obtain the Web address for the map from your teacher. 2. Locate your region on the physiographic map. Use a colored pencil to mark its location on the outline map of the lower 48 states. You may use the outline map in your travel brochure. 66 Earth’s Dynamic Surface Name Date Class Lab B continued 3. Research to find photographs of your region. Study the photographs carefully, keeping in mind what you have learned in this chapter about the processes that change Earth’s surface. Based on your observations, explain how you think your region formed. 4. Research your region and record your findings below. Use at least two references to obtain data about your region. Your data can include the geologic history of the region, landforms characteristic of the region, diagrams showing how the landforms formed, and any other information you find interesting. 5. Use the information you have gathered to make your travel brochure. Include a map of your region, the region’s name, your travel slogan, two or more paragraphs describing the processes that formed and that continue to change the region, and several photographs and/or drawings of the region. Lab Tips • Remember to rewrite any information you find in books or on the Internet in your own words. • When using the Internet, make sure the information is from a reliable source, such as a college or a university, an online encyclopedia, or a government agency. • Your brochure must serve two purposes. It must be informative, yet easy to understand. It also must persuade people to visit that region of the country. Earth’s Dynamic Surface 67 Name Date Class Lab B continued Analyze and Conclude 6. Research Information How did your research compare to how you thought your region formed? 7. Classify the major Earth processes that produced your region as well as the processes that continue to change it. 8. The Big Idea How do the motion of tectonic plates and the processes of weathering, erosion, and deposition change Earth’s surface? Communicate Your Results Use your travel brochure to put together a 1-minute speech about your region and why people should come to visit it. Practice your speech. Be prepared to answer any questions potential tourists might have! Extension Find the tour guides for two other regions that are close to yours. Talk about any similarities and differences among the regions and how they formed. 68 Earth’s Dynamic Surface Name Date Class Lab C Model Changes in Your Region Directions: Use the information and data from the Lab Earth’s Changing Surface to perform this lab. You have learned that Earth’s surface can change due to factors such as earthquakes and erosion. In Lab B, you created a travel brochure using information about the landforms of a specific region of the United States. Now make a model to show how your region has changed over time and/or how it continues to change. For example, you could model the effects of an earthquake or of forces that cause erosion, such as water or wind. Develop a hypothesis about your model and then test your hypothesis. Please note that you must complete Lab B before beginning Lab C. Also, have your teacher approve your design and safety procedures before beginning your experiment. Earth’s Dynamic Surface 69 Name Date Class Chapter Key Concepts Builder Earth’s Dynamic Surface End-of-Chapter Practice Directions: Work with a group to recommend solutions to problems caused by erosion. Research how erosion affects your area. Find answers to the following questions: What types of erosion affect your area? Which local or state agencies have information about erosion? Gather and then analyze your data. Address questions such as the following: How does erosion affect local landforms? How does erosion affect the local economy? Research and recommend solutions to problems caused by erosion in your area. What action is already being taken to address the problem? What resources are needed to implement your recommended solutions? Are your recommendations feasible to implement? Compare your recommendations with those of other groups. As a class, decide which solutions are best. Consider sending your recommendations to a local official for feedback. Recommendation requirements: • includes research about local problems caused by erosion • includes visuals and references • is organized in a logical manner • includes contributions from each group member 70 Earth’s Dynamic Surface Name Date Class Chapter Test A Earth’s Dynamic Surface Multiple Choice Directions: On the line before each question or statement, write the letter of the correct answer. 1. Tectonic plates move as the result of A. weathering and erosion. B. convection and subduction. C. deposition and earthquakes. 2. Which geologic feature forms when two continental plates converge? A. subduction zones B. folded mountain ranges C. mountains that have volcanic peaks 3. Rust is the result of A. chemical weathering of iron. B. physical weathering of calcite. C. freezing and thawing of water. Matching Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is used only once. Matching Set 1 4. weathering that changes the size of rocks A. chemical weathering 5. the moving of sediment from one location to B. deposition another 6. weathering that changes the makeup of rocks C. erosion D. physical weathering 7. the laying down or settling of sediment Matching Set 2 8. caused by movement along a fault E. convection 9. vent in Earth’s crust through which molten rock F. earthquake flows 10. circulation within fluids caused by differences in G. lava density and thermal energy H. magma 11. molten rock deep within Earth I. volcano 12. molten rock that reaches the surface Earth’s Dynamic Surface 71 Name Date Class Chapter Test A continued Interpreting a Diagram Directions: Label the diagram by choosing terms from the word bank and writing them in the correct spaces. Each term is used only once. divergent boundary transform boundary mid-ocean ridge volcanic arc subduction Short Answer Directions: Respond to each statement on the lines provided. 18. State the theory of plate tectonics in your own words. 72 Earth’s Dynamic Surface Name Date Class Chapter Test A continued 19. Contrast mid-ocean ridges with folded mountains. Concept Application Directions: Respond to each statement on the lines provided. Use complete sentences. 20. Infer why most earthquakes and volcanoes occur along plate boundaries. 21. Apply The Mississippi River is the second-longest river in the United States. It begins as a small steep, stream in Minnesota and becomes larger and wider as it travels southward toward Mississippi. It empties into the Gulf of Mexico. Explain how the beginning and end of the Mississippi River might change the land. Earth’s Dynamic Surface 73 Name Date Class Chapter Test B Earth’s Dynamic Surface Completion Directions: On each line, write the term from the word bank that correctly completes each sentence. Not all terms are used. chemical convection convergent deposition divergent faults lava magma physical transform 1. erosion weathering is any process that breaks rocks into smaller pieces. 2. weathering is any process that changes the composition of rocks. 3. The dropping of sediment in a new location is called . 4. Movement of rock layers along cause earthquakes. 5. Most volcanoes form along plate boundaries. 6. The circulation within fluids caused by differences in density and thermal energy is called . 7. is molten rock deep within Earth. 8. is molten rock that erupts onto Earth’s surface. Multiple Choice Directions: On the line before each question or statement, write the letter of the correct answer. 9. The theory of plate tectonics states that A. convection occurs in the crust. B. earthquakes occur along faults. C. volcanoes are mountains made of lava. D. slabs of rock move relative to one another. 10. Which geologic feature does NOT form when an oceanic plate converges with a continental plate? A. B. C. D. 74 subduction zone deep ocean trench folded mountain ranges mountains that have volcanic peaks Earth’s Dynamic Surface Name Date Class Chapter Test B continued 11. Which would erode the smallest-sized sediment? A. a melting glacier B. a severe windstorm C. a river flowing down a slope D. a glacier moving down its valley 12. The formation of rust occurs during the chemical weathering of minerals and rocks that contain A. B. C. D. iron acid feldspar limestone Interpreting a Diagram Directions: Label the diagram by choosing terms from the word bank and writing them in the correct spaces. Not all terms are used. convection convergent boundary divergent boundary folded mountains mid-ocean ridge oceanic trench transform boundary subduction volcanic arc Earth’s Dynamic Surface 75 Name Date Class Chapter Test B continued Short Answer Directions: Respond to each statement on the lines provided. 18. Explain why most earthquakes occur near plate boundaries. 19. Contrast two processes that cause tectonic plates to move. Concept Application Directions: Respond to each statement on the lines provided. Use complete sentences. 20. Most volcanoes form at convergent boundaries. Describe the differences between a quiet volcanic eruption and an explosive volcanic eruption. 21. Evaluate Some people say that wind erosion is like sandpaper. Explain why. 76 Earth’s Dynamic Surface Name Date Class Chapter Test C Earth’s Dynamic Surface Completion Directions: On each line, write the term or phrase that correctly completes each sentence. 1. changes the composition of rocks, whereas breaks rocks into smaller pieces. 2. is defined as the loosening and movement of ; is defined as the laying down or dropping of at new locations. 3. Tectonic plates move as the result of and . 4. The theory of plate tectonics states that . 5. is melted rock deep within Earth, whereas is melted rock that reaches Earth’s surface. 6. occur when rocks move along faults and release energy as the fault . 7. Folded mountains form when two continental plates . is a vent in Earth’s crust. 8. A(n) 9. Clay and rust form as the result of . 10. Plant roots growing into cracks in rocks is an example of . Multiple Choice Directions: On the line before each statement, write the letter of the correct answer. 11. Most earthquakes occur along plate boundaries because A. faults that cause earthquakes form only where plates meet. B. convection in the mantle releases energy in the form of waves. C. the rigid plates break when they are exposed to too much force. D. the partly melted asthenosphere shifts and slides under pressure. 12. Most volcanoes form when A. two continental plates collide. B. an oceanic trench is subducted. C. magma cools and hardens deep within Earth. D. an oceanic plate collides with a continental plate. Earth’s Dynamic Surface 77 Name Date Class Chapter Test C continued Interpreting a Diagram Directions: Label the diagram by writing the correct name of the landform or process on each line. Short Answer Directions: Respond to each statement on the lines provided. 18. Discuss how mountains form along different types of plate boundaries. Remember to discuss the two different types of mountains that form as the result of convergence. 78 Earth’s Dynamic Surface Name Date Class Chapter Test C continued 19. Contrast how a river might change the land as it flows from upstream to downstream. Concept Application Directions: Respond to each statement on the lines provided. Use complete sentences. 20. Synthesize The Appalachian Mountains formed as the result of convergence, yet they are relatively low and rounded compared to similar mountain chains. Explain why. 21. Discuss how the agents that change Earth’s surface might affect an area that experiences four distinct seasons. Hint: Which agent would be dominant during each season? Earth’s Dynamic Surface 79