Lecture_11_Circulation - P r o p e r tie s o f th e C r u s...

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1 • Properties of the Crust • Continental drift – Evidence – Problem • New data for a new explanation – Exploring the sea floor • mid ocean ridges • Sediment distribution • Magnetic stripes – Remote Detection of Earthquakes • Theory of Plate Tectonics – Rigid plates (lithosphere) – Plate boundaries – Production = destruction – Mantle convection Tuesday: Chemistry of the Crust • Ocean crust: dark and dense. Reflects partial melting of the mantle (once) • Continental crust: less dense, less Mg, Fe. Reflects further partial melting and separation
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2 What is responsible for relief/landforms? Why do earthquakes occur where they do?
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3 Why are active volcanoes where they are? Prevailing theory “Because they have always been there and always will be”
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4 Alfred Wegener, a German climatologist, developed the Continental Drift hypothesis in 1915 based on “fit” of the edges of the continents Supported by matches in fossils, mountain belts and glacial deposits
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5 Problem! • Wegener proposed that continents
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This note was uploaded on 02/08/2011 for the course EAS 1601 taught by Professor Lynch during the Spring '08 term at Georgia Institute of Technology.

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Lecture_11_Circulation - P r o p e r tie s o f th e C r u s...

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