1. Plate Tectonics Chapter 17.1

2. Layers of the Earth

3. Alfred Wegener 1912 – Proposed the theory of Continental Drift Supported by fossil and rock type evidence “Pangaea” His theory was disregarded and mocked by the science community

4. Continental Drift

6. Convection Currents

7. Plate Boundaries

8. Divergent Boundary – moving apart Convergent Boundary – moving together Transform Fault Boundary – moving sideways past each other

9. Divergent boundary of two continental plates.

10. Convergent boundary of two oceanic plates.

11. Convergent boundary of an oceanic plate and a continental plate.

12. Convergent boundary of two continental plates.

13. Transform-fault boundary where the North American and Pacific plates are moving past each other.

14. Evidence for Plate Tectonics 1960s – Geologic Survey on the Mid- Atlantic Ridge Magnetic “bands” were observed The Bands magnetic polarities were alternating