1. The document discusses plate tectonics and how the slow convection of hot rocks within the Earth causes the surface to constantly change over millions of years through processes like volcanism, earthquakes, mountain building and erosion. 2. Major concepts covered include the three main types of plate boundaries (divergent, convergent, and transform), how each forms different geological features, and evidence that supports the theory of plate tectonics such as seafloor spreading and magnetic reversals in oceanic crust. 3. Plate tectonics provides a unifying framework for understanding otherwise disconnected geological phenomena and the dynamic processes that have shaped features like ocean floors, continents, and mountain ranges over Earth's

1. Plate Tectonics Chapter 17 Great Idea: The entire earth is still changing, due to the slow convection of soft, hot rocks deep within the planet.

5. Pike’s Peak in Colorado, US

6. Slopes and Peaks in Young and Older Mountains

7. The Dynamic Earth

10. Mount St. Helens – Active Volcano

11. Cross Section of a Volcano

12. Earthquake Scarp

13. Tsunami

15. Continental Atlantic Coastlines

18. Topographic Map of the Ocean Floor

20. Parallel Magnetic Strips

21. Magnetic Strips that Parallel Ocean Ridges

25. Plate Tectonics: A Unifying View of Earth

29. Earth’s Major Plates and Direction of Motion

32. Mantle Convection

36. Divergent Plate Boundary

38. Africa’s Great Rift Valley

40. Ocean-Ocean Plate

42. Continental-Continental Plate

44. Ocean-Continental Plate

46. Transform Plate Boundary

50. US Mountains

52. Volcanoes Form Above a Subduction Zone

53. The Hawaiian Islands

55. Seismic Waves Passing through Earth