Theory of Continental Drift

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Presentation transcript:

Theory of Continental Drift

Alfred Wegener 1915 Continental Drift

Evidence for continental drift Matching Coastlines (jigsaw puzzle)

Matching folded Mountain ranges (Atlas, Appalachians, and Scandinavian Highlands)

Matching glacier deposits

Matching Fossils (Lystrosaurus)

Evidence for continental drift Matching coastlines Matching folded mountains Matching glacier deposits Matching fossils

Pangaea A Greek word meaning “All-lands” Split apart approximately 200 MYBP

1915 maps by Wegener of Pangaea

Continental drift Theory that continents drift on the surface of the Earth No mechanism proposed No one believed this was possible Do you think continents can float ?

Glomar Challenger 1960’s this ship took core samples of ocean floor rocks as it crossed the Atlantic Ocean A map was produced from this data showing the rock types and ages From this map a new theory was developed to explain Wegener’s evidence

Ocean floor rock ages Get older symmetrically away from ridges, the oldest rocks have to be 200,000,000 years old Theory: sea floor splits apart and rocks move away from each other Process: Seafloor spreading Seafloor spreading provides clues to mechanism driving continental drift

Topography of ocean floor

Does sea floor spreading explain everything ? If the Atlantic Ocean is spreading, doesn’t that mean some place is being squeezed together

Recurring patterns in oceans

Plate Tectonics Combining Wegener’s evidence, Glomar Challenger’s data, and the following world map the present theory of Plate Tectonics came into being Video about plate movements over time

Earthquake and Volcano Distribution Weekly quakes map