Unit4Earthquake.ppt

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1、April14,2010,QinghaiEarthquakeMay12,2008,WenchuanEarthequake,inSichuanProvince,ChinaThereisstillhope……Lifeisstrong…EarthquakesTangShan’sNewLook:34yearsago：TheSeismographs(地震仪）It’snotalwayscalmbeforeastorm.Therearebrightlightsinthesky.Thewellhasdeepcracksinit,andthewaterinitrisesandfall

2、s.Asmellygascameoutofthecracks.Chickensareflyinganddogsarebarking,andpigsandcowsaretoonervoustoeat.Fishjumpoutofthepond,andmicerunwidelyoutofthefields.TangshanEarthquake:Itstruckat3:42amonJuly28,1976.8.2Richterscale(thesizeofanearthquake里氏震级)242,419peoplewerekilled,and164,581peoplewere

3、severelyinjured.Economicdamageestimatedat3billionyuan.HereistheRichterscale:Lessthan3.5:quakerecordedbutnotfelt3.5-5.4:usuallyfeltbutrarelyanydamage5.5-6.0:littledamagetostrongbuildings;bigdamagetoweakbuildings6.1-6.9:somedamagewithin100km7.0-7.9:bigdamageoveralargearea8.0-larger:terri

4、bledamageoverhugeareaThereasonforsomanyinjuries:PeopleinTangshanhadnotbeenpreparedwhensuchanearthquakeoccurred.Theearthquakestruckatnightwhenmostpeoplewereinbed.ItwasextremelypowerfulearthquakethatitseffectscanbefeltinBeijingwhichis200kmaway.Question:Haveyoueverthoughtofthecausesofeart

5、hquake?platetectonics:板块运动Scientistbelievethatthesurfaceoftheearthiscoveredbyanumberofmovingplates.Sometimestwoplatesmovetowardsandpushagainateachother,andatthismoment,theearthquakehappen.Whatshallwedoiftheclassroombeginstoshake?Discussion:Howtosurviveinanearthquake?IndoorsOutdoorshide

6、undersomestrongfurnitureorbythefurniturehideinthecornerofthehouseDon’tjumpoutofthebuildingdropontothegroundandcoveryourheadkeepawayfromthebuildingsandthethesighsandkeepawayfromthepowerlinesmakesureyourfamilyandneighborsaresafe,afteryouconfirmyourfamilyissafety,checkifyourneighborsareal

7、lright.Workwithyourneighborstofreevictimsfromunderdebirsorfallenfurnitureandtogivefirstaid.Assignmentforyou:Gothroughthepassageandthenfinishthecomprehendingtasksonpage27.thankyou!