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Unit 19_ Natural Disasters part 1 - TeacherTube

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					      Unit 19:
Natural Disasters pt 1
          NATURAL DISASTERS
• An event that occurs naturally and affects the
  earth’s surface and environment
   – Man made disasters occur as a result of human error
     and or accidents
        NATURAL DISASTERS
• Can be land, water or weather disasters
   – Land disasters occur due to movement of the earth’s
     land surface
      • Volcanic eruptions, earthquakes, landslides and avalanches
   – Water disasters involve huge amounts of water
     moving at a greater speed
      • Floods, storms and tsunamis
   – Weather disasters occur due to extreme changes in
     weather elements
      • Tornadoes, droughts, blizzards, heat waves
Unit 19: Typhoons




                    TYPHOONS
Unit 19: Typhoons




                    WHAT IS A TYPHOON?
         • Large tropical storms that produce strong
           winds and large volumes of rains
         • Occurs during certain periods of the year
         • Eye of the typhoon is a low pressure region
           where the winds spin
               – Strong winds and rains surround the eye of the
                 storm
Unit 19: Typhoons




                    EFFECTS OF TYPHOONS
         • ON THE ENVIRONMENT
               – May cause landslides, uproot trees,
               – May produce a storm surge (rise in the water
                 level as the typhoon makes a land fall) which
                 may result to flooding
         • ON PROPERTIES
               – Water and wind damage of properties such
                 as cars, houses, and even death may result
Unit 19: Typhoons



           SIGNS OF AN APPROACHING
                   TYPHOON
         • Satellite pictures
               – Show speed of wind, clouds and storms
               – Can estimate the course and strength of a
                 typhoon
         • Aircrafts pick up info by flying close to it
         • Ships monitor oceanic temp
         • Weather radars on land
Unit 19: Typhoons




            MEASURES TO BE OBSERVED
         • Before a typhoon
               –    Turn off and unplug appliances
               –    Secure glass windows
               –    Secure objects which may be carried by the wind
               –    If and when needed, go to an evacuation center
               –    Bring an emergency kit
               –    If not, stay indoors and away from windows
               –    Hide in basements and underground bunkers
               –    Have an adequate supply of clothes, food, batteries,
                    drinking water; have portable radio
Unit 19: Typhoons




            MEASURES TO BE OBSERVED
         • During a typhoon
               – Continue to stay indoors
               – Monitor radio for updates
Unit 19: Typhoons




            MEASURES TO BE OBSERVED
         • After a typhoon
               – Be careful in going around the premises
                    • Be on the lookout for broken materials, including
                      electrical lines
               – Ensure structural integrity of your house
               – Stay away from flood waters, if possible
Unit 19: Volcanic Eruptions




                        VOLCANIC
                        ERUPTIONS
Unit 19: Volcanic Eruptions




                              VOLCANOES
         • An opening in the ground though which
           lava, hot gases, ash and rocks are released
           at a great force.
         • They are formed when tectonic plates
           move towards or away from each other
         • The PLATE TECTONIC theory explains why
           plates move
Unit 19: Volcanic Eruptions


                HOW A VOLCANO ERUPTS
Unit 19: Volcanic Eruptions



      THE PACIFIC
      RING OF
      FIRE
      •Belt around the
      Pacific Ocean
      •Active volcanoes
      are located due to
      the active
      movement of the
      plates
Unit 19: Volcanic Eruptions




                       TYPES OF VOLCANOES

• Erupts regularly                 • A currently               • Scientists
  in the past and                 inactive volcano            consider them
  will do so again                  but still shows             unlikely to
    in the future                 signs of eruption                erupt

Active                         Dormant                    Extinct
 Taal Volcano                 Three Sisters in Colorado   Cococachi in Equador
Unit 19: Volcanic Eruptions




              DANGERS OF AN ERUPTION
         • Explosive (pyroclastic) eruptions may
               – Eject ash, gas and very big rocks
                      • Makes breathing difficult
                      • Smell of sulphur is foul
               – Hot lava may destroy outlying properties
         • Non explosive eruptions may also destroy
           properties
Unit 19: Volcanic Eruptions



    SIGNS OF A VOLCANIC ERUPTION
         • A volcanic eruption may be predicted
         • As magma starts to move
               – Seismographs and seismometers detect and record this
               – Gas and steam emissions
               – Tremors and bulges
Unit 19: Volcanic Eruptions




             MEASURES TO BE OBSERVED
         • Before a volcanic eruption
               – For those living near volcanoes
               – Keep eye and mouth protection
               – Put together an emergency kit
               – Stay away from permanent danger zones
               – Do not resist evacuation
                      • Know evacuation route
Unit 19: Volcanic Eruptions




             MEASURES TO BE OBSERVED
         • During a volcanic eruption
               – Stay clear of lava and other pyroclastic materials
               – Avoid rivers and other low lying areas
                      • Route taken by hot lava and lahar (water and mud)
               – Protect arms and legs, as well as eyes and mouth
               – Close windows and doors to prevent ash from
                 getting in the house
Unit 19: Volcanic Eruptions




             MEASURES TO BE OBSERVED
• After a volcanic
  eruption
     – Remove ash from roofs
       (have adults do this)
     – Continue wearing
       protective gears
     – Stay away from rivers
       which may be routes of
       lahar
                             sources
•   gadgets.boingboing.net
•   wunderground.com
•   worldatlas.com
•   pacificislandparks.com
•   volcanochild.co.uk
•   Istockphoto.com
•   ecuador-travel.net
•   ellerbruch.nmu.edu
•   eos.higp.hawaii.edu
•   armageddononline.org
•   oml13.glogster.com

				
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