The document discusses the interior structure of the Earth, including the crust, lithosphere, and asthenosphere. The crust is divided into continental and oceanic types, with continental crust composed of granite and less dense than oceanic basalt crust. Below the lithosphere lies the asthenosphere, where the plates of the lithosphere float. The document then covers plate tectonics theory and how the movement of crustal plates over the mantle leads to features like rift valleys, oceanic and continental convergence zones, and transform faults at the boundaries between major tectonic plates.

1. The interior structure of the earth

2. The interior structure of the earth

3. The crust and part of the upper mantle = lithosphere about 100 km thick Less dense than the material below it so it “floats” The interior structure of the earth The Lithosphere

4. The plastic layer below the lithosphere = asthenosphere The plates of the lithosphere float on the asthenosphere The interior structure of the earth The Asthenosphere

5. The interior structure of the earth The Crust Two types of crust: Continental Oceanic

6. Differences between oceanic crust and continental crust? Continental crust is composed of granite while the oceanic crust is composed of basalt. The density of the continental crust is less than the oceanic crust, thus it floats higher on the mantle.

7. How this tears the surface apart

8. In 1912 a German scientist named Alfred Wegener proposed the theory that the crustal plates are moving over the mantle. This was supported by fossil and rock type evidence; also matching of coastline shapes.

11. Pangaea

12. The Spreading Continents

14. Plate Boundaries Map Major plates only

15. Plate Boundaries Map

16. Types of Plate Boundaries

17. Types of Plate Boundaries

18. Rift Valleys - ccd

19. Oceanic Convergence

20. Oceanic to Continental Convergence

21. Continental Collision

22. Transform Faults

23. The future?