Plate Tec Evidence
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The document provides evidence for plate tectonics, including both the original "old stuff" presented by Wegener as well as newer "new stuff". Wegener noticed that continents fit together like puzzle pieces and that the same fossils were found in matching continental margins, but he lacked an explanation for the mechanism of motion. Modern evidence includes earthquake data, locations of hot spots, ages of ocean floor rocks, and patterns of mantle convection, which together provide strong support for the theory of plate tectonics and the processes of seafloor spreading and ridge push/slab pull.
Plate Tec Evidence
- 1. Evidence for Plate Tectonics The Old Stuff and The New Stuff
- 2. Wegeners Evidence The Old Stuff
- 6. 油
- 7. Problem with Wegeners Stuff No Mechanism
- 8. New Evidence for Plate Tectonics The New Stuff
- 9. 油
- 10. Earthquake Data
- 11. Hot Spots
- 12. Ocean Drilling Location Age of Rocks Ridge Crests Youngest Continental Margins 180 mya Continental Crust 4.0 bya
- 13. Mantle Convection Convergent Divergent Downward Upward Arm Slab Pull Ridge Push
- 14. Seafloor Spreading 1 2 3 4 5 The seafloor contracts and sinks. Crust spreads along an ocean ridge and magma fills the gap that is created. Hot magma, which is less dense than the surrounding material, is forced toward the crust. New seafloor moves away from the ridge, cools and becomes more dense than the material beneath it. New seafloor forms as the magma hardens.
- 15. Do you believe in Plate Tectonics?
- 16. 油