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5_plate_tectonics_A - PlateTectonicsI GS222 Lecture5...

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Plate Tectonics I GS222 Lecture 5
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Overview - this lecture When did people first suspect the continents move?  What were the early hypotheses? What role did technology play in plate tectonics? Why were geomagnetic reversals key to the  establishment of plate tectonic theory?
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Early speculation For most of human history, it was believed that  continents were fixed and immutable  During the 16 th  century CE, DaVinci & Ortelius noticed  the continents fit together, especially South America  and Africa Antonio Snider  published earliest map in 1858 a French geographer found identical fossils in U.S. and Europe believed that Biblical flood caused the break-up of  supercontinent many scientists made similar observation in 1800s 
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The continental jigsaw puzzle from “Creation and Its Mysteries Unveiled”
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Continental Drift For > 150 years, geographers and scientists  suggested continents move Only recently (in the last 50 years) have scientists  agreed on theory of plate tectonics Alfred Wegener  proposed hypothesis of continental  drift in 1915 (first detailed account) a German meteorologist initiated 100 year scientific process from  hypothesis to well-tested theory perished in 1930 Greenland expedition, well  before his idea had gained acceptance
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The scientific process Collection of scientific facts through  observation and measurement. A tentative, testable statement about the natural  world that can be used to build more complex  inferences and explanations. Development of observations, experiments, and  models to test (and, if necessary, revise) the  hypothesis. In science, a well-substantiated explanation of  some aspect of the natural world that can  incorporate facts, laws, logical inferences  and tested hypotheses.
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Evidence for continental drift 1)  
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