Theory of Continental Drift

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Theory of Continental Drift. The Present is the Key to the Past. James Hutton 1785 Uniformitarianism. Known as the father of geology. Uniformitarianism. The present is the key to the past The geological forces and processes of today are the same as those from the past. - PowerPoint PPT Presentation

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<ul><li><p>Theory of Continental DriftThe Present is the Key to the Past</p></li><li><p>James Hutton 1785 UniformitarianismKnown as the father of geology</p></li><li><p>UniformitarianismThe present is the key to the pastThe geological forces and processes of today are the same as those from the past.These forces are very slow and methodical.</p></li><li><p>Alfred Wegener 1915 Continental Drift</p></li><li><p>Evidence for continental driftMatching Coastlines(jigsaw puzzle)</p><p>Becomes more of a match when you use the continental shelves.</p></li><li><p>Evidence for continental driftMatchingfolded mountainRanges(Atlas, Appalachians, and Scandinavian Highlands)</p></li><li><p>Evidence for continental driftMatching glacierdeposits</p></li><li><p>Evidence for continental driftSalt beds found in Texas and Germany. These are only created in dry tropical areas.</p></li><li><p>Evidence for continental driftCoal deposits found in USA. Coal is created in environments similar to the Everglades.</p></li><li><p>Evidence for continental driftMatchingFossils(Lystrosaurus)</p></li><li><p>Evidence for continental driftMatching coastlinesMatching folded mountainsMatching glacier depositsSalt beds in Texas and GermanyCoal beds in West Virginia Matching fossils</p></li><li><p>PangaeaA Greek word meaning All-lands Split apart approximately 200 MYBP</p></li><li><p>1915 maps by Wegener of Pangaea</p></li><li><p>Continental driftTheory that continents drift on the surface of the EarthNo mechanism proposedNo one believed this was possible</p></li><li><p>Glomar Challenger1960s this ship took core samples of ocean floor rocks as it crossed the Atlantic OceanA map was produced from this data showing the rock types and agesFrom this map a new theory was developed to explain Wegeners evidence</p></li><li><p>Ocean floor rock agesGet older symmetrically away from ridges, the oldest rocks have to be 200,000,000 years oldTheory: sea floor splits apart and rocks move away from each otherProcess: Seafloor spreadingSeafloor spreading provides clues to mechanism driving continental drift</p></li><li><p>Topography of ocean floor</p></li><li><p>Does sea floor spreading explain everything ?If the Atlantic Ocean is spreading, doesnt that mean some place is being squeezed together</p></li><li><p>Recurring patterns in oceans</p></li><li><p>Plate TectonicsCombining Hutton theory, Wegeners evidence, Glomar Challengers data, and the following world map the present theory of Plate Tectonics came into being</p></li><li><p>Earthquake and Volcano DistributionWeekly quakes</p></li><li><p>Unexpected consequence of continental drift</p></li></ul>

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