Understanding Natural Disasters: Causes and Effects

1. N a t u r a l D i s a s t e r BY SHAIMAA ELZEINI 1

2. What is a natural disaster ? 2 A natural disaster is a major adverse event resulting from natural processes .

3. Natural disasters are tremendous forces of nature that have been known to destroy cities and towns all over the world. 3

4. Some of the most well- known natural disasters that have happened every year are volcanoes and earthquakes. 4

5. Trophy Time What does it mean to say an earthquake is a natural disaster? A. It was man-made B. It is a disaster caused by nature C. It is a disaster from the sky. 5

6. Trophy for you!! You did great! 6

7. Lets look over some information Natural disasters are tremendous forces of nature 7

8. Lets look over some information Natural disasters are tremendous forces of nature 8

9. Volcanoes What are volcanoes? Please click on the image to watch the video before moving on http://www.schooltube.com/video/82dab119f64822786fe1/Volcanoes 9

10. 10 Volcanoes are mountains, but they are different from other mountains. They are built by accumulation of their own eruptive products.

11. A Volcano Defined A volcano is a land form where molten rock erupts through the surface of the planet. Gases and rock shoot up through and spill over with lava fragments. 11 http://www.schooltube.com/video/fd 866c529a9649f66be4/Volcano%20Er uption

12. Trophy time! 12 A land form where molten rock erupts through the surface of the planet. A sudden shaking of the earth. A vast tropical storm that has winds whipping around. What is a volcano?

13. 13 You Did Great!

14. 14 Sorry, a sudden shaking of the earth is an earthquake Lets try again !

15. 15 Sorry, a vast tropical storm that has winds whipping around is a hurricane . Now ,Lets Try again. http://www.youtube. com/watch?v=R0Zbj7 S22zs

16. The word "volcano" comes from the little island of Vulcano in the Mediterranean Sea off Sicily. 16

17. 17 A volcano as seen by the eyes of a child

18. Types of volcanoes Volcanologists have classified volcanoes into groups based on the shape of the volcano, the materials they are built of, and the way the volcano erupts. 18 volcanic material: lava, rock fragment, and gas

19. Volcano Groups 19 Composite Volcanoes Shield Volcanoes (also called shields) Cinder Cones Spatter Cones Complex Volcanoes (also called compound)

20. Ready to get your trophy? Volcanoes are a mountain which accumulated by 1. Folding and crumpling. 2. Uplift and Erosion. 3. Accumulation of their own eruptive products 20

21. 21 You Did Great!

22. 22 Lets try again!

23. Click the right answer The types of volcanoes are Composite Volcanoes Earth quake Shield Volcanoes Cinder Cones Hurricane 23

24. 24 You Did Great!

25. 25 Please try again!

26. Positive Products from Volcanoes Geothermal Energy Volcanic ash 26

27. Ash blows over land and increases soil fertility for forests and agriculture by adding nutrients and acting as a mulch. Groundwater heated by large, still hot magma bodies can be tapped for geothermal energy. 27

28. Trophy time! 28 Geothermal Energy An earthquake Positive Products from Volcanoes are Power point

29. Trophy for you!! You did great! 29

30. Please lets try again. 30

31. Earthquake Please watch this vedio ! http://www.schooltube.com/search/?term=EART HQUAKE 31

32. An Earthquake A trembling or shaking of the ground caused by the sudden release of energy stored in the rocks below the surface, radiating from a fault along which movement has just taken place. 32

33. Measuring an Earthquake The Richter scale 1-10 33

34. Facts about Earthquakes Earthquakes can occur at any time of the year and at any time of the day or night. Earthquakes occur under all weather conditions, sunny, wet, hot, or cold--without special tendency. 34

35. Trophy time! 35 Shaking of the ground caused by the sudden release of energy stored in the rocks below the surface. What is an earthquake? A land form where molten rock erupts through the surface of the planet. A vast tropical storm that has winds whipping around.

36. 36 You Did Great!

37. 37 Sorry, a land form where molten rock erupts through the surface of the planet is a volcano..

38. 38 Sorry, a vast tropical storm that has winds whipping around is a hurricane.

39. Myths about Earthquakes The ground does not open up and swallow people (a commonly feared myth). Open ground cracks may form during an earthquake--related, for example, to land sliding or ground slumping. But such fissures are open gaps (they don't "swallow") that a person could stand in. 39

40. Trophy Time What scale is used to measure an earthquake? Pedometer Richter scale Mechanical scale 40

41. Trophy for you!! You did great! 41

42. Lets' try again. 42

43. Wrap Up 43 Back Good job! Review: earthquakes and volcanoes are natural disasters. A volcano is a land form where molten rock erupts through the surface of the planet. Gases and rock shoot up through and spill over with lava fragments. Earthquakes and volcanoes occur in the Ring of Fire.

44. The Resources. 44 1- http://vulcan.wr.usgs.gov/LivingWith/VolcanicFacts/misc_volcanic_fa cts_questions.html 2- http://www.seis.utah.edu/qfacts/genfaq.shtml

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