Naturaldisasters
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Naturaldisasters

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this briefly defines the vaious types of natural disasters.

this briefly defines the vaious types of natural disasters.

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Naturaldisasters Naturaldisasters Presentation Transcript

  • What are Natural Disasters?
  • The World is always changing.Natural disasters are changes which areso great they may cause damage to theshape of the land or to the lives of peopleand other living things.Great changes happen deep inside theEarth and on its surface. The changes onthe outer part of the Earth happenbecause of different kinds of weather.
  • What are Natural Disasters? Volcanic eruption Earthquake Cyclone or Hurricane Avalanche Flood Drought Forest fire or Bushfire
  • VolcanoesA volcanic eruption is the spurting out ofgases and hot lava from an opening in theEarth’s crust.Pressure from deep inside the Earth forcesash, gas and molten rock to the surface.
  • EarthquakeAn earthquake is a violent shaking of theground. Sometimes it is so strong that theground splits apart. When parts of the earth, called plates,move against each other giant shockwaves move upwards towards the surfacecausing the earthquake.
  • Cyclone, Hurricane, Tornado or TyphoonA Cyclone is a fierce storm with storm windsthat spin around it in a giant circle. During acyclone trees can be uprooted, buildingscan be destroyed and cars can beoverturned.
  • AvalancheAn Avalanche is a movement of snow, ice androck down a mountainside. Avalanches happenvery suddenly and can move as fast as a racingcar up to 124mph.Avalanches can be caused by – snow melting quickly snow freezing, melting then freezing again someone skiing a loud noise or an earth tremor
  • FloodA flood is caused by an overflow of water whichcovers the land that is usually dry.Floods are caused by heavy rain or by snowmelting and the rivers burst their banks andoverflow.Costal floods are caused by high tides, a rise insea level, storm waves or tsunami (earthquakesunder the sea).
  • DroughtA drought is the lack of rain for a long time.In 1968 a drought began in Africa. Children bornduring this year were five years old before rainfell again.
  • Forest Fire or BushfireFires can burn out of control in areas of forest orbush land. Fires are caused by lightning, sparksof electricity or careless people. Wind may blow abushfire to areas where people live.