2. Theory of Plate Tectonics – an overview Geo 100N Spring 2005

4. Inside the Earth USGS

5. The Lithosphere http://volcano.und.edu/vwdocs/vwlessons/plate_tectonics/part1.html

6. Basic Concepts of Plate Tectonics

7. The Earth’s surface is covered by about 12 lithospheric plates USGS

8. The plates move slowly (a few cm/year). USGS

9. Most endogenic geological activity occurs at or near plate boundaries. Mt St Helens, 1980 Endogenic = process that originates within the Earth’s interior

10. Plate interiors are relatively quiet geologically

11. Plate Movements and Boundaries

14. Sea-floor spreading of oceanic lithosphere USGS, Digital elevation model

15. Mid Atlantic Rift at Iceland Þingvellir (Thingvellir), Iceland

17. East African Rift Zone Oldoinyo Lengai, Kenya

20. Aleutian Islands, Alaska Kanaga