Unit 1 Module 1. Convergent Boundary Activity 3.pptx

processes along convergent boundary

1. Watch and Observe.

2. Processes and Landforms Along with Convergence of Plates Activity 3: A,B & C

3. Convergent Boundary Continental Plate   Oceanic Plate Oceanic Plate   Oceanic Plate Continental Plate   Continental Plate

4. Activity 1: Head on collision Part A: Converging Continental Plate and Oceanic Plate

5. Objective Explain the processes that occur along convergent boundaries. Determine the consequences of colliding plates.

6. Procedure Plate A Plate B

7. Q1. What type of plate is Plate A? How about Plate B? Why did you say so?

8. Ans. Plate A is an oceanic plate because it is relatively thinner than plate B. Plate B is a continental plate because it is thicker and floats higher than plate A

9. Q2. Describe what happens to Plate A as it collides with Plate B? Why?

10. Ans. Plate A bends downward because Plate A is denser than Plate B.

11. Q3. What do you think may happen to the leading edge of Plate A as it continues to move downward? Why?

12. Ans. The leading edge of plate A will start to melt because the temperature beneath the crust is higher .

13. Q4. What do you call this molten material?

14. Ans. Magma

15. Q5. What is formed on top of Plate B? Plate B

16. Ans. Volcanoes or Volcanic Arc Plate B

17. Q6. As the plates continue to grind against each other, what other geologic event could take place?

18. Ans. Earthquakes Earthquakes

19. Converging Oceanic Crust Leading Plate and Continental Crust Leading Plate During the convergence of an oceanic plate and a continental plate, the denser oceanic plate slides under the continental plate. This process is called subduction .

20. Converging Oceanic Crust Leading Plate and Continental Crust Leading Plate The following will take place: Formation of a volcanic arc Formation of an oceanic trench Occurrence of earthquakes

21. Activity 1: Head on collision Part B: Convergence of Two Oceanic Plates

22. Oceanic Plate A Ocean Water Figure11: Cross-sectional diagram of converging oceanic plates Oceanic Plate B

23. PLATE A PLATE B

24. Q1. What are the geologic processes/events that will occur because of this plate movement?

25. Ans. The following geologic processes/events may happen: Plate B undergoes subduction or sinking of plate towards the mantle. Earthquakes may happen Trenches will form Volcanoes will form at the surface of Plate A

26. Q2. What geologic features might form at the surface of Plate A? Volcanoes will form on the surface of Plate A.

27. Q3. If the edge of Plate A suddenly flicks upward, a large of amount of water may be displaced. What could be formed at the surface of the sea?

28. Ans. Tsunami is formed at the surface of the sea

29. PLATE A PLATE B

30. Convergence of Oceanic Plates When two oceanic plates converge, they will undergo subduction process

31. Convergence of Oceanic Plates The following geologic events will take place: Formation of a volcanic island arc Formation of trench Generates shallow, intermediate and deep earthquakes Tsunami may be produced from strong earthquakes generated by the ocean floor.

32. Formation of the Philippine Archipelago Many parts of the country originated from oceanic-oceanic convergence.

33. Majority of the islands of the Philippine archipelago are considered part of the Philippine Mobile Belt formed 65 million years at the southern edge of the Philippine Plate and are considered as part of the island arcs

34. Sundaland block Eurasian Plate Figure 13: Sundaland block of Eurasian Plate which includes Palawan, Mindoro and Zamboanga .

35. Formation of the Philippine Archielago Other parts of the Philippines such as Palawan, Mindoro, and the Zamboanga peninsula are the highland sections of the Sundaland block of the Eurasian plate

36. Formation of the Philippine Archielago The Philippine Mobile Belt eventually collided with the Sundaland block which explains the presence of trenches such as the Manila-Negros-Cotabato Trench System and the Sulu Trench.

37. East Luzon Trough Philippine Trench Figure15: Subduction of Philippine Sea Plate

38. Formation of the Philippine Archielago Aside from the formation of trenches and troughs , the downward movement of oceanic lithospheres underneath the Philippine Archipelago creates active volcanic chains . .

39. Formation of the Philippine Archielago For example, the descent of the West Philippine Sea oceanic lithosphere along the Manila Trench created a volcanic chain from Taiwan to Mindoro. Some of the known active volcanoes in this chain are Pinatubo in Central Luzon, and Taal in Batangas .

40. Formation of the Philippine Archielago Also, the constant dipping movement of slabs induces frequent moderate to strong earthquakes at various depths, gives rise to mountain ranges and develops the geologic character of the Philippine Archipelago.

41. Activity 1: Head on collision Part C: Two Continental Plates Converging

42. Convergence of Continental Plates When two continental plates meet head-on, neither is subducted . Instead the crust tends to buckle and be pushed upwards.

43. Convergence of Continental Plates No subduction means no trench, no volcanoes, no volcanic island arc is created instead a large group of tall mountains called Mountain Ranges form. Shallow earthquakes may also happen

44. Collision of India and Asia

45. The Himalayas Earth’s highest mountain range, the Himalayas, was formed millions of years ago when the Indo-Australian Plate crashed into the Eurasian Plate. Even today, the Indo-Australian Plate continues to push against the Eurasian Plate at a rate of about 5 cm a year!

46. Convergent Plate Boundaries Oceanic - Continental Subduction occurs Volcanic arc Trench Earthquakes Oceanic - Oceanic Subduction occurs Volcanic Island arc Trench Earthquakes Tsunami Continental - Continental Mountain Ranges Earthquakes No subduction No Volcanoes No Trench No Island Arcs