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Plate Tectonics
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Lecture 12
3/4/98
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| | On Monday, we discussed mass extinctions and some of the causes behind them |
| | Today, we will look at an earth process that could be the driving force behind many mass extionction |
| | Plate Tectonics, is a unifying theory in geology that helps explain many of the changes that we see in the earths history. |
| | Plate Tectonics is geology's theory of evolution. |
| | It is a unifying theory that allows explanation of many geologic processes |
| | Plate Tectonics has revolutionized the way that we view the earth |
| | The earth's surface is dyamic not static |
| | The "fit" of the continents. |
| | Devonian Old Red Sandstone in England |
| | similar in age and appearence to rocks on N. America |
| | Features of the ocean floor |
| | Seafloor Spreading and Plate tectonics |
| Plate Tectonics and Extinctions |
| | openning and closing oceans |
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