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Tectonics

Chapter 15 powerpoint

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Geology Chapter 15 Geology The science devoted to the study of dynamic processes occurring on the Earth?s surface and in its interior Essential Question #1 What are the characteristics of the three major concentric zones of earth? Three Concentric Zones Core ? innermost zone Extremely hot Solid inner part surrounded by liquid molten material Mantle ? middle zone Outermost part is solid rock Asthenosphere = inner part made of hot partly melted pliable rock that flows Crust ? outermost zone Continental crust Oceanic crust Earth?s Crust and Upper Mantle Lithosphere = Crust and outermost Mantle Fig. 15-3, p. 337 Spreading center Ocean trench Plate movement Subduction zone Oceanic crust Continental crust Continental crust Material cools as it reaches the outer mantle

continental drift

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Turner Burwick 12/2/2009 Period 7 Vocabulary Continental drift - the lateral movement of continents resulting from the motion of crustal plates. Pangaea - The landmass that existed when all continents were joined, from about 300 to 200 million years ago. Seafloor spreading - a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out. Plate tectonics - a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past adjacent plates.
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