ES Chapter 17 Plate Techtonics Notes

ES Chapter 17 Plate Techtonics Notes - Chapter 17 Plate...

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Chapter 17 Plate Techtonics Section 17.1 Drifting Continents Alfred Wegener (1912) - Theory of Continental Drift Idea that continents were all joined at one time and then drifted apart. Pangea (“all earth”)= giant supercontinent Evidence: 1. Continents appear to fit together like puzzle pieces. 2. Rock types in Appalachian Mountains match with 3. Similar plant & animal fossils found where continents appear to have been joined. 4. Evidence of glaciers in places like Australia. 5. Evidence of coal deposits in Antarctica (indicated it was warmer at one time). Section 17.2 Theory of Sea Floor Spreading A chain of mountains ( Mid-Atlantic Ridge ) runs down the middle of the Atlantic Ocean. (SONAR helps us map the ocean floor.) 1. Layer of mud that covers rest of ocean floor is missing here. 2. Rocks get older as you move away from ridge. 3. Ridge is hotter than rest of ocean. 4. Magnetic polarity is a mirror image on opposite sides of the
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ES Chapter 17 Plate Techtonics Notes - Chapter 17 Plate...

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