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Plate 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.

CIVI 231 Geology for Civil Engineers

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9/10/2012 1 1 - 1 Tarbuck, Lutgens, Tsujita, Hicock, Earth: An Introduction to Physical Geology 3Ce Chapter 1: An Introduction to Geology and Plate Tectonics 1-2 The Science of Geology ? Geology ?geo? ? earth, ?logos? ? discourse ? Physical geology ? studies Earth materials; seeks to understand processes that operate on and beneath its surface ? Historical geology ? seeks to understand the origin of Earth and its development through time 9/10/2012 2 1-3 The Science of Geology ? Geology, people, and the environment ? Relationships between people and the natural environment include: ? Natural hazards, resources, world population growth, and environmental issues 1-4 The Science of Geology

Plate Tectonics

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Plate Tectonics .? Theory of how the continents moved apart ( Continental Drift) driven bySeafloor Spreading? .? Tectonics - important motions of Earth?s Crust .? Plates- Make up the crust Tectonic Plates . Crust made up of 12 or so plates study of movement/ formation of these plates Continental Drift .? Theory that all continents are moving across Earth?s surface Evidence: Fossils Glacial Striations/Grooves Rock deposits Jigsaw puzzle of Modern Continents Creation Of Continental Drift .? Alfred Wegener - 1912 .? Continents were together at one point ---> ? Pangea? -- ?All Earth? .? Over millions of years ---> continents split apart .? Wegener discredited because he was a? meteorologist and he could not explain a force for moving plates
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