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DO NOT WRITE ON THIS PAPER Earth’s Layers Unit 6 Lesson 3 Key Concepts Choose the letter of the best answer. 1. Which compositional layer of Earth is the thinnest? A. the inner core B. the outer core C. the crust D. the mantle 2. Earth has five layers based on physical properties: the inner core, the outer core, the mesosphere, the asthenosphere, and the lithosphere. Which of these layers do the tectonic plates move on top of? A. outer core B. lithosphere C. mesosphere D. asthenosphere 3. The innermost physical layers of Earth are the inner core and outer core. Which two metals are the inner and outer core mostly made of? A. lead and iron B. iron and nickel C. lead and mercury D. nickel and mercury 4. Evelyn is making a model of Earth to show how the physical layers correspond to the compositional layers. Which of the following should Evelyn show in her model? A. The physical layers exactly match the compositional layers. B. The crust is the only compositional layer not included in the physical layers. C. The physical layers of the inner core and outer core form a single compositional layer. D. The physical layer of the asthenosphere includes the compositional layer of the crust. 5. Earth’s physical layers correspond to Earth’s compositional layers. Which part of the mantle is also part of the lithosphere? A. the fluid, hot part B. the rigid upper part C. the soft moving part D. the lower stationary part