1. NATURAL DISASTER Objectives Main Menu Earthquake Credits Natural Disaster Prior Knowledge Resources Tropical Cyclone Case study: Cyclone in Bangladesh Evaluation

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4. OBJECTIVES To define natural disaster To list down the four different types of natural disaster To explain the causes of an earthquake and tropical cyclone To list down the effects/problems causes by an earthquakes and tropical cyclone To describe measures to minimize the damages caused by an earthquake and tropical cyclone

5. Prior Knowledge The three layers of the Earth’s structure : core, mantle, and crust. The plates movements and its boundaries, and the distribution of the world's volcanic and earthquake areas. The students must have some background knowledge of the followings:

6. NATURAL DISASTER DIFFERENT TYPES OF NATURAL DISASTER DEFINITION OF NATURAL DISASTER

7. WHAT IS A DISASTER? A DISASTER IS AN EVENT WHICH BRINGS GREAT TROUBLE AND HARDSHIP NATURAL DISASTER OCCURS BECAUSE OF UNUSUAL MOVEMENTS OF THE EARTH, WIND, OR WATER

9. EXAMPLES OF NATURAL DISASTER EARTHQUAKES

10. TROPICAL STORMS EXAMPLES OF NATURAL DISASTER

11. DROUGHTS EXAMPLES OF NATURAL DISASTER

12. EXAMPLES OF NATURAL DISASTER FLOODS

13. EXAMPLES OF NATURAL DISASTER VOLCANIC ERUPTION

14. EARTHQUAKE What is an earthquake? Earthquake zones around the world Effects and problems caused by an earthquake Terms related to an earthquake Minimizing the damage caused by an earthquake

16. Earth’s Crustal Plates One plate sometimes moves against another and this often puts a great strain on the rocks that they tear at the weakest point

19. Isoseismal lines Seismic focus Epicentre

20. Seismometers

21. Richter Scale

22. Earthquake zones around the world

24. Tsunami

25. Tsumani Wave A tsunami wave flows toward the shore after a small earthquake in the Sunda Strait of Indonesia. Tsunamis are often mistakenly called tidal waves, but they are not caused by the gravitational forces involved in tides. Instead, tsunamis are believed to be caused by a tilting of the ocean floor, undersea landslides, or undersea volcanic eruptions

26. Effects and problems caused by an earthquake Each year about 500,00 earthquakes are recorded and of these about 1000 are strong enough to cause damage. As a result of these, roads and railways twist and buckle. Sewers, gas and water pipes and electricity cables break. Buildings crack and fall down. In the worst earthquakes, whole towns have been destroyed, and many people killed or injured.

27. Twisted and buckled roads

28. Sewers, gas, water pipes, and electricity cables break

29. Buildings crack and fall down

32. TROPICAL CYCLONES What are tropical cyclones? Names given to tropical storms Where do tropical cyclone born? Case Study: Tropical cyclones in Bangladesh Tropical cyclone around the world How tropical cyclone is formed? How do tropical cyclone gains its energy?

36. TROPICAL CYCLONE AROUND THE WORLD

38. Tropical cyclones are born over the oceans, between latitudes 5  and 15  North and South

40. FORMATION OF CUMULO-NIMBUS CLOUD

41. CUMULO-NIMBUS CLOUD

44. Case Study: TROPICAL CYCLONES IN BANGLADESH How do tropical cyclone bring disaster to Bangladesh? 1991 Cyclone In Bangladesh How did the cyclone been spotted? The worst affected areas hits by the cyclone in Bangladesh Problems caused by tropical cyclone

45. The worst affected areas hits by the cyclone in Bangladesh

47. These giant strong waves cause many deaths on the low coastal plains and offshore island

54. PROBLEMS CAUSED BY TROPICAL CYCLONES PROBLEMS CAUSED BY TROPICAL CYCLONES -WITH REFERENCE TO THE BANGLADESH Measures to minimize the problems of tropical cyclone in Bangladesh

57. 1.Multiple Choice 2.Cross word puzzle 3. Fill in the Blanks 4. Matching exercises Evaluation

58. http://msnbcmedia.msn.com/i/msnbc/Components/Interactives/Technology_Science/Science/Earthquakes/zFlashAssets/Earthquakes_v21.swf