1、A great disaster filmA great disaster film2014 Annual masterpieceAnnual masterpieceHeavy dust here!Bring your own tissue!Heavy dust here!Bring your own tissue!A dust storm is a meteorological phenomenon common in arid and semi-arid regions.Dust storms arise when a gust front or other strong wind blo
2、ws loose sand and dirt from a dry surface.Particles are transported by saltation and suspension,a process that moves soil from one place and deposits it in another.Strong WindLoosely Dust&SandDrought or arid conditions,and varied wind causesOver-plowed,over-grazed landEffects Effects Environmental c
3、risisEcosystem impactsProperty damageInjuries,and deaths.Land DesertificationAtmospheric EnvironmentEtc.TremendousTremendous!Measures Relieve pressure on pasture by captive breeding(圈圈养减轻草场压力）养减轻草场压力）Reafforestation（退耕还林）（退耕还林）Establish an efficient system of wind prevention and sand fixation.（防风固沙）
4、（防风固沙）Conserve water and soil resources.（保持水土）（保持水土）Emphasize on prevention and control of desertification of farmland（防止和控制土地沙（防止和控制土地沙漠化）漠化）Complete more water conservancy infrastructure construction.(农田水利设施建设）农田水利设施建设）How to survive a dust storm?a.Put a mask over your a.Put a mask over your nose
5、and mouthnose and mouth Method 1 of 3:Surviving a Storm on Foot b.Protect your eyes c.Get to high ground(safe,solid,high point)d.Shield yourself from flying objects e.Wait out the stormMethod 2 of 3:Surviving a Storm in a CarOutrun the stormPull the car over and stopTake cover and stay putMethod 3 o
6、f 3:Thinking Ahead for Next TimeKnow where dust and sand storms occur.Heed（留心）（留心）dust storm warnings.Be prepared in case of an emergency:A mask designed to filter out small particulates Airtight goggles A water supply A warm blanketDust Bowl(1930-1936)It fell across our cityLike a curtain of black
7、rolled down,We thought it was our judgmentWe though it was our doom.The period began in 1931 when severe drought covered the mid-western and southern US plains.As the crops died,dust from the over-plowed and over-grazed land,whipped skyward by strong,dry winds,formed great dust storms that became kn
8、own as black blizzards.In 1932,fourteen dust storms were reported in the US,but in the following year,the number jumped to 38.One of the most powerful sandstorms in decades hit the Saudi Arabian capital Riyadh.Suburban Sydney,6:20 am,23 September.At dawn with the sun low in the sky,the color was a d
9、eep orange/brown.By 8:00 am the color was a less intense gold/brown hue(色调）.A man walks his dog through Observatory Hill near Sydney on September 23,2009 as Australias biggest city is shrouded in an eerie blanket of red dust.Sydneys cars and buildings turned orange as strong winds blew desert dust a
10、cross the city,snarling commuter and air transport and prompting a warning for children and the elderly to stay indoors.A dust storm blankets Sydneys iconic Opera House at sunrise September 23,2009.You could feel the dust,You could feel the dust,you could taste the dust.you could taste the dust.Thanks!
