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Quick Review 1. The top portion of the Earth’s mantle = asthenosphere 2. The asthenosphere is made of = molten rock 3. How does the asthenosphere move = it moves in a circular pattern called a convection current. Quick Review 4. Temperature of the molten rock of the mantle close to the core = very high 5. Direction the molten rock of the mantle near the core moves = rises Quick Review 6. Temperature of the molten rock in the asthenosphere = cooler 7. Direction the molten rock in the asthenosphere moves = sinks Lesson 7.4 – Plate Tectonics and Pangea I can describe plate tectonics and Pangea. (4a) 1. The lithosphere is divided into different pieces called tectonic plates. I can describe plate tectonics and Pangea. (4a) 2. These plates move over time, but they move very slowly. A. The plates only move a few centimeters each year. I can describe plate tectonics and Pangea. (4a) 3. These plates move because of the convection currents in the asthenosphere. A. As molten rock rises from the core, cools and sinks it pushes the plates. I can describe plate tectonics and Pangea. (4a) 4. Since continents are part of the plates, as the plates move, the continents move. 5. 200 million years ago, all of the continents were once next to each other and formed a “supercontinent.” This supercontinent is called Pangea. I can describe plate tectonics and Pangea. (4a) 6. Evidence of Pangea A. The continents fit together like puzzle pieces. B. Identical plant and animal fossils of the same age have been found in rocks in Africa and South America. Guided Practice 1. Does the picture at the right show Pangea? 2. What motion of the mantle and asthenosphere has caused the continents to move? Do you know what that means? (5 questions) 1. The lithosphere is broken into different pieces that move over time. What are these pieces called? Pangea B. Tectonic Plates C. Fossils D. Supercontinents A. 2. Which distance below could be the distance that a piece of the lithosphere would move in one year? It could move 5 millimeters B. It could move 12 meters C. It could move 5 centimeters D. It could move 12 kilometers A. 3. A force causes the pieces of Earth’s lithosphere to move. What causes this force and where does it occur? A. Jet streams in the California Current and Gulf Stream Current. B. Jet streams in the troposphere and stratosphere. C. Convection currents in the inner and outer core D. Convection currents in the mantle and asthenosphere. 4. What is Pangea? A. The idea that the continents are moving closer together. B. The idea that the continents are moving apart. C. The idea that the continents were once all connected. D. The idea that the continents never move. 5. Which of these gives evidence for the existence of Pangea? A. B. C. D. The coastlines of the continents do not fit together. The continents have remained in place for millions of years. Fossils of the same animal were found on two different continents. Fossils of two different animals were found on two different continents.