Plate Tectonic Theory……. Why Alfred Wegener thought of it……

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Presentation transcript:

Plate Tectonic Theory……. Why Alfred Wegener thought of it……

Continental Fit……

Glacial Deposits……

Matching Geology

Matching fossils

Alfred Wegener needed a mechanism to move the continents………. Sea Floor Spreading

Discovery of mid-oceanic ridge……

Symmetric magnetic anomalies adjacent to mid-ocean ridge axis…..

Figure A-5a and b Paleomagnetism – magnetic signature locked in rocks

Magnetic Reversals

Age of ocean crust……

Figure 4-5 Global pattern of earthquakes

Figure 9.14 Global pattern of volcanoes – Ring of Fire

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