Natural disasters and their impact towards the environment


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Natural disasters and their impact towards the environment

  1. 1. Done byP Gourisankaran
  2. 2. Some of the Natural Disasters•Earthquakes•Hurricanes•Lightning•Forest Fires•Tsunami•Tornados•Volcanoes•Blizzards•Floods•Drought
  3. 3. EarthquakeA sudden movement of the earths crustcaused by the release of stresscollected along faults or by volcanicactivity.
  4. 4. LightningA brilliant electric spark discharge in theatmosphere, occurring within athundercloud, between clouds, orbetween a cloud and the ground isknown as Lightning.
  5. 5. TsunamiAn unusually large sea wave producedby a seaquake or undersea volcaniceruption is called a Tsunami.
  6. 6. VolcanoA vent in the earths crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals is known as a Volcano.
  7. 7. BlizzardA violent snowstorm with winds blowingat a minimum speed of 35 miles perhour and visibility of less than one-quarter mile for three hours is called aBlizzard.
  8. 8. FloodsA temporary rise of the water level, as ina river or lake or along a seacoast,resulting in its spilling over and out of itsnatural or artificial confines onto landthat is normally dry. Floods are usuallycaused by excessive runoff fromprecipitation or snowmelt, or by coastalstorm surges or other tidal phenomena.
  9. 9. TornadoA violently rotating column of airextending from a powerful cloud to theEarth, ranging in width from a fewmeters to more than a kilometer andwhirling at speeds between 40 and 316miles per hour.
  10. 10. DroughtA long period of abnormally low rainfall,especially one that adversely affects growing orliving conditions causes Drought.
  11. 11. Facts on Drought The cost of losses due to drought in the United States averages $6-8 billion every year, but range as high as $39 billion for the three year drought of 1987-1989, which was the most costly natural disaster documented in U.S. history. The two major droughts of the 20th century, the 1930s Dust Bowl drought and the 1950s drought, lasted five to seven years and covered large areas of the continental U.S.
  12. 12. Heat Wave An air mass of high temperature covering an extended area and moving relatively slowly A period of abnormally hot and usually humid
  13. 13. How Earthquakes Impact theEnvironment collapsing buildings property damage mud slides fires floods tsunamis loss of power
  14. 14. How Hurricanes Impact theEnvironment causes erosion destroys houses, buildings, and other structures heavy flooding of inland areas sometimes leads to Tornadoes loss of power contaminated water supply
  15. 15. How Lightning Impacts theEnvironment causes forest fires leads to loss of power
  16. 16. How Tsunamis Impact the Environment leads to the destruction of houses, buildings and other structures causes a huge loss of power causes erosion fresh water gets contaminated
  17. 17. How Volcanic Eruptions Impact theEnvironment houses, buildings, and other structures destroyed fires toxic gases released into the atmosphere carbon dioxide emitted from volcanoes adds to the natural greenhouse effect. loss of habitat
  18. 18. How Blizzards Impact theEnvironment flooding when snows melt trees fall power outages hypothermia
  19. 19. How Flooding Impacts theEnvironment disease loss of habitat houses, buildings, and other structures destroyed household wastes get into the water system power outages
  20. 20. How Tornadoes Impacts theEnvironment tornadoes could hit hazardous or toxic materials which could carried by a thunderstorm and then transported along ways down stream. could transport certain types of small animals and plants across the land destroys topsoil and crops
  21. 21. How Drought Impacts the Environment young trees die dried up lakes and other water sources leads to loss of livestock and crops people use more fuel during droughts losses or destruction of fish and wildlife habitat lack of food and drinking water for wild animals increase in disease in wild animals, because of reduced food and water supplies increased stress on endangered species lowers the water levels in reservoirs, lakes, and ponds leads to the loss of wetlands wind and water erosion of soils, reduced soil quality
  22. 22. THE END