quarter 4 week 1 leeson in science 6PLATE TECTONICS.pptx

presentation

1. Quick Review: Layers of the earth 1. Layers of the Earth Layers of the Earth – Smart Learning for All

2. Plate tectonics

3. Plate boundaries The Earth’s crust is divided into two: Continental Crust Oceanic Crust

4. Tectonic plates A tectonic plate is a massive, irregularly shaped piece of solid rock. It is commonly made up of both continental and oceanic crust (lithosphere). The tectonic plates are moving in different directions

5. Vocabulary words Crustal Plate- a rigid (hard) layer of the Earth’s crust. Plate Boundaries- areas where two plates meet, separate, or slide past each other.

6. Vocabulary words Tectonic Plate- a big solid rock composed of continental and oceanic lithospehere . Subduct - a process in which one edge of the plate is forced below another plate.

7. history About 200 million years ago, there were no crustal plates. There is a one giant supercontinent called Pangaea and one giant super-ocean called Panthalasa .

8. Assemble the puzzle

9. The pangaea

10. The idea suggested by Alfred Wegener, a German scientist, according to him: Pangaea broke into pieces that formed the crustal plates and slowly moved until they reached their present position. The crustal plates are moving slowly.

11. Continental drift theory

12. The earth’s major plates

13. The major crustal plates Eurasian Plate African Plate Pacific Plate Indian Plate Australian Plate Antarctic Plate American Plate (North and South)

14. The Plate boundaries

15. TYPES OF PLATE BOUNDARIES 1.Convergent Plate Boundary 2. Divergent Plate Boundary 3. Transform Plate Boundary

16. 1. Convergent plate boundary This occur where tectonic plates collide. It can be of three types: Oceanic – Oceanic Oceanic – Continental Continental - Continental

17. Oceanic-Oceanic Convergent Boundary

18. Oceanic-Continental Convergent Boundary

19. Continental-Continental Convergent Boundary

20. Convergent plate boundary

21. When Tectonic Plates collide, the heavier Crustal Plate is pushed below, its is called Subduction Zone. Convergent plate boundaries create earthquakes, ridges, deep trenches and chains of active volcanoes.

22. Convergent plate boundary

23. Divergent plate boundary Divergent Plate Boundary occurs when two plates move away from each other. When plates break apart, the lithosphere thins and ruptures forming fractures on the crust.

24. Divergent plate boundary The fractures formed become filled with magma upwelling . As the magma cools off, a new crust is formed between the diverging plates. In the oceanic crust, it is called Seafloor Spreading.

25. Earthquakes, faults and underwater volcanic eruptions occur in a divergent plate boundary. Ex: Mid-oceanic Ridge in the Atlantic Ocean

26. Seafloor spreading

27. Transform plate boundary Known also as Transform Fault Boundary. Occurs when two plates slide past each other. As the two plates glide each other in different directions, earthquakes occur. Ex: San Andreas Fault in California

28. Transform plate boundary

29. San andreas fault

30. The three plate boundaries

31. The plates

32. Video presentations 1. Plates 2. Plate Boundaries Tectonic Plate Boundaries Tectonics of the Planet Earth