Plate Tectonics 6.1 Earth has several layers. 6.2 CHAPTER NEW CHAPTER Plate Tectonics the BIG idea The movement of tectonic plates causes geologic changes on Earth. 6.1 Earth has several layers. 6.2 Continents change position over time. 6.3 Plates move apart. 6.4 Plates converge or scrape past each other. CHAPTER OUTLINE CHAPTER RESOURCES

Earth has several layers. 6.1 Earth has several layers. inner core lithosphere outer core crust mantle crust mantle lithosphere asthenosphere outer core asthenosphere inner core tectonic plate VISUALIZATION Examine continental movement over the past 150 million years. CLASSZONE.COM CHAPTER RESOURCES SECTION OUTLINE

Earth has several layers. 6.1 Earth has several layers. inner core outer core mantle crust lithosphere asthenosphere tectonic plate This layer is soft enough to flow slowly like hot tar. You can imagine the lithosphere as solid pieces of pavement resting on hot tar. CHAPTER RESOURCES SECTION OUTLINE

Continents change position over time. 6.2 Continents change position over time. Gravity and motions in the asthenosphere move tectonic plates over Earth’s surface. continental drift Pangaea Earth’s tectonic plates. Arrows indicate the direction of movement. mid-ocean ridge convection convection current theory of plate tectonics CHAPTER RESOURCES SECTION OUTLINE

6.3 Plates move apart. New crust is formed at divergent boundaries. Features include: divergent boundary • mid-ocean ridges convergent boundary transform boundary rift valley magnetic reversal hot spot CHAPTER RESOURCES SECTION OUTLINE

6.3 Plates move apart. Oceanic crust at a mid-ocean ridge is younger than crust near a trench. divergent boundary • records of magnetic reversals- the south magnetic pole becomes the north magnetic pole and the north becomes the south for unknown reasons (geographical poles stay the same) convergent boundary transform boundary rift valley magnetic reversal hot spot CHAPTER RESOURCES SECTION OUTLINE

6.3 Plates move apart. New crust is formed at divergent boundaries. Features include: divergent boundary • mid-ocean ridges • records of magnetic reversals convergent boundary • rift valleys transform boundary rift valley magnetic reversal hot spot CHAPTER RESOURCES SECTION OUTLINE

6.3 Plates move apart. New crust is formed at divergent boundaries. Features include: divergent boundary • mid-ocean ridges • records of magnetic reversals convergent boundary • rift valleys transform boundary VISUALIZATION Explore what happens along plate boundaries. CLASSZONE.COM rift valley magnetic reversal hot spot CHAPTER RESOURCES SECTION OUTLINE

Plates converge or scrape past each other. 6.4 Plates converge or scrape past each other. Crust is destroyed or folded at convergent boundaries. • Subduction boundaries form island arcs, deep-ocean trenches, and coastal mountains. subduction continental-continental collision • Collision boundaries can form mountains. oceanic-oceanic subduction oceanic-continental subduction CHAPTER RESOURCES SECTION OUTLINE

Plates converge or scrape past each other. 6.4 Plates converge or scrape past each other. Crust is neither formed nor destroyed at transform boundaries. subduction continental-continental collision oceanic-oceanic subduction oceanic-continental subduction CHAPTER RESOURCES SECTION OUTLINE

6.1 Earth has several layers. I. Earth has several layers. inner core A. Earth is made up of materials with different densities. outer core mantle B. Earth’s layers have different properties. crust 1. Core, Mantle, Crust lithosphere C. The lithosphere is made up of many plates. asthenosphere tectonic plate CHAPTER RESOURCES KEY CONCEPT SUMMARY

Continents change position over time. 6.2 Continents change position over time. II. Continents change position over time. continental drift A. Continents join together and split apart. Pangaea 1. Evidence for Continental Drift mid-ocean ridge 2. Pangaea and Continental Drift convection B. The theory of plate tectonics explains how plates and their continents move. convection current theory of plate tectonics 1. Evidence from the Sea Floor 2. Causes of Plate Movement 3. Putting the Theory Together CHAPTER RESOURCES KEY CONCEPT SUMMARY

6.3 Plates move apart. III. Plates move apart. divergent boundary A. Tectonic plates have different boundaries. B. The sea floor spreads apart at divergent boundaries. convergent boundary transform boundary 1. Mid-Ocean Ridges and Rift Valleys 2. Sea-Floor Rock and Magnetic Reversals rift valley C. Continents split apart at divergent boundaries. magnetic reversal D. Hot spots can be used to track plate movements. hot spot CHAPTER RESOURCES KEY CONCEPT SUMMARY

Plates converge or scrape past each other. 6.4 Plates converge or scrape past each other. IV. Plates converge or scrape past each other. subduction A. Tectonic plates push together at convergent boundaries. continental-continental collision 1. Continental-Continental Collision 2. Oceanic-Oceanic Subduction oceanic-oceanic subduction 3. Oceanic-Continental Subduction oceanic-continental subduction B. Tectonic plates scrape past each other at transform boundaries. C. The theory of plate tectonics helps geologists today. CHAPTER RESOURCES KEY CONCEPT SUMMARY

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