Natural disasters 2.
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Natural disasters 2.



Power Point Presentation realizada como parte de una unidad integrada rrealizada desde las áreas de Ciencias Naturales y Ciencias Sociales para 1º ESO.IES Al-Iscar.

Power Point Presentation realizada como parte de una unidad integrada rrealizada desde las áreas de Ciencias Naturales y Ciencias Sociales para 1º ESO.IES Al-Iscar.



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Natural disasters 2. Presentation Transcript

  • 1. Hurricanes
  • 2. What are Hurricanes? • Hurricanes are intense tropical cyclones with a maximum speed of at 65 knots (74mph).
  • 3. By Any Other Name In the Eastern Pacific they are called typhoons. In the Indian Ocean they’re called cyclones.
  • 4. How are they formed? Hurricanes gather heat and energy through contact with warm ocean waters. Evaporation from the seawater increases their power.
  • 5. Hurricanes rotate in a counterclockwise direction around an "eye" in the Northern Hemisphere and clockwise direction in the Southern Hemisphere.
  • 6. Physical Make-up • Hurricanes have a diameter of less than 100 miles to over 500 miles.
  • 7. When does hurricane season start? The Atlantic hurricane season is from June 1 to November 3.0
  • 8. Hurricane Power • Hurricanes are ranked on a 1-5 scale called the SaffirSimpson Scale.
  • 9. Hurricane Power • A 1 would be a minimal hurricane with winds 74-95 mph. • A 5 is catastrophic with winds 155 mph+
  • 10. Danger from Hurricanes • In the US, most people that die from hurricanes are killed by fresh water flooding.
  • 11. Danger from Hurricanes • Worldwide, most die from the storm surge.
  • 12. Storm Surge • To Answer that question let’s take a look at storm surge.
  • 13. THE WIND! • Flying objects in the wind can be very dangerous.
  • 14. THE WIND! • Take a look at this piece of wood that was driven into the palm tree.
  • 15. Some historical hurricanes • Hurricane Kenna2002 • Katrina2005 • Ernesto2012
  • 16. Tornadoes.
  • 17. What is a tornado? A tornado is a violent rotating column of air extending from a thunderstorm to the ground
  • 18. Tornadoes power The most violent tornadoes can cause a tremendous destruction with wind speeds of up to 300 mph.
  • 19. Tornadoes power They can destroy large buildings, uproot trees and hurl vehicles hundreds of yards.
  • 20. How do tornadoes form? Most tornadoes form from thunderstorms. You need warm, moist air from the Gulf of Mexico and cool, dry air from Canada. When these two air masses meet, they create instability in the atmosphere.
  • 21. What do tornadoes look like? Tornadoes can appear as a traditional funnel shape, or in a slender rope-like form.
  • 22. When are tornadoes most likely to occur? Tornadoes can happen at any time of the year and at any time of the day.
  • 23. Volcanoes
  • 24. What is a ? A volcano is a mountain that forms when magma reaches the surface of the Earth. Magma rises because it is less dense than the solid rock around it.
  • 25. What causes volcanoes? Tectonic Plate Boundaries
  • 26. A volcano erupts when magma and gases find a way to escape, so they burst to the surface through a vent. An eruption can be quite gentle or very violent.
  • 27. Types of volcano Volcanoes can be active, dormant or extinct. • A volcano is active, or alive, when it erupts often. • When a volcano is dormant, or sleeping, it has not erupted for a long time – but it might in the future. • A volcano is extinct, or dead, when it hasn’t erupted for at least 100,000 years.
  • 28. Parts of volcanoes Crater – a deep hollow at the top of a volcano. Lava – melted rock that flows down the volcano. Magma – melted rock inside the Earth. Vent – a crack on the side of a volcano where magma can escape
  • 29. Volcanic Effects • • • • • • Pyroclastic flow Lahars/Mud flows Pyroclastic fall Lava flow Noxious Gas Earthquakes
  • 30. Volcanic Fatalities • 92,000 Tambora, Indonesia 1815. • 36,000 Krakatau, Indonesia 1883. • 29,000 Mt Pelee, Martinique 1902. • 15,000 Mt Unzen, Japan 1792.
  • 31. Pyroclastic Flow • For example, eruption of Vesuvius in 79 AD destroyed the city of Pompeii.