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SECTION EARTH HAS SEVERAL LAYERS. BIG IDEA The CHAPTER 1 Plate Tectonics 1.1 Reading Study Guide A movement of tectonic plates causes geologic changes on Earth. KEY CONCEPT Earth has several main layers. Vocabulary inner core a ball of hot, solid metals at the center of Earth outer core a layer of hot liquid metals surrounding the inner core mantle Earth’s thickest layer, it has a more rigid upper portion and a softer, lower portion. crust thin layer of rock that surrounds Earth lithosphere the crust and the very top of the mantle together asthenosphere a layer of hot, soft rock in the upper mantle tectonic plate large and small rock slabs that make up the lithosphere Review 1. The building blocks of Earth are . Take Notes Copyright © by McDougal Littell, a division of Houghton Mifflin Company I. Earth is made up materials with different densities. (p. 9) 2. Fill in the main-idea web for the main idea shown. Earth is made up of materials with different densities. Denser materials . Less dense materials . Other materials . II. Earth’s layers have different properties. (p. 10) 3. Why would scientists set off an underground explosion? THE CHANGING EARTH, CHAPTER 1, READING STUDY GUIDE A 13 013-014-sean-urb-b0101-rsga 13 3/10/04, 2:27:45 PM A–B. Core, Mantle, Crust (p. 10) On the diagram of Earth below, label each layer and write whether the layer is liquid, solid, or partly solid. 5. For each row in the table, write the correct layer of Earth that corresponds to the description. CHAPTER 1 Plate Tectonics 4. Thickest layer Home to all life on Earth Earth’s thinnest layer Copyright © by McDougal Littell, a division of Houghton Mifflin Company Hot, solid metals Liquid metals Hot, soft rock at top of mantle 6. Which layer is under the most pressure? Where does the pressure come from? III. The lithosphere is made up of many plates. (p. 12) 7. Fill in the main-idea web for the main idea shown. The lithosphere is made up of many plates. The size of tectonic plates may be . Most large tectonic plates include . Tectonic plates fit together on Earth's surface like . 14 THE CHANGING EARTH, CHAPTER 1, READING STUDY GUIDE A 013-014-sean-urb-b0101-rsga 14 3/10/04, 2:27:53 PM