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文檔簡介
Welcome
to
the
unitNatureinthebalanceMountain&
Forest——palatialLand——prosperous——peacefulNatureiskindofalovingmother,
butalsoabutcherincoldblood.—Victor
HugoUnbalancedNatureNaturalDisasters:Discoverthepowerofsome
disastersTsunamiFloodTyphoonHurricaneVolcanoWildfireEarthquakeLandslideNaturalDisasters:TsunamiFloodTyphoonHurricaneVolcanoEarthquakeLandslideWildfireNatuNraat
ulrDaliDsaissa
stteerrssaar
erepodweesrtfurlu;ctive.1980StHelens,theUnitedStates,57peopleand7,000animals
killed.1906SanFrancisco3,000peopledieandover80percentofthecitydestroyed.VolcanoEarthquak2020,AustraliaBushFire,27peopleand1000000000animalskilled.In2014,alandslideinIndiaWildfireLandslidkilledatleast150people.1971,Bangladesh,300,000to1millionpeoplekilled.1992,Flores,Indonesia,yphoonTsunam2,000killedand90,000homeless1998,CentralAmerica,about11,000
Hurricanekilledand1.5millionhomeless.Flood
1998Bangladesh
2,000killedand30millionhomeless.Natureiskindofalovingmother;weshouldloveher,
andrespecther;Natureisalsoabutcherincoldblood;weshouldfearher,
andlearntolivewithheranger——NaturalDisasters.Homework:1.Try
toknowmorenaturaldisasters;2.Prepareforthereading;Whenlotsofseawatergetshotinthesummersun,itstartstomovehigherupintothesky.Then,coolerairarounditrushesin.Itfillsthespacethatisleft.Aftertheairgetswarmer,itstartstomovequickly,makingwind.Thewindgoesincircles,anditkeepsmovinghigherinthesky.Thewarmertheairgets,thequickerthewindmoves.Andwhenthewindmovesfasterthan30metersasecond,atyphoon
begins.Inlatesummer,abovethewarm,tropicalseasthatlieeithersideoftheequator,enormousrollingstormsystemscandevelopwithwindspeedsof120kph.Thesestormsarecalledhurricanes
whentheystartovertheAtlanticOcean,cyclones
intheIndianOcean,andtyphoons
inthePacific.Thesestormscantravelthousandsofkilometres,leavinga
lotofdestruction.hotgasesWhena
volcanoerupts,__________,volcanicashandevenrocksescapethrougha
largeopeningatthetop.Thegasesandashcancauseacidrainandevenstorms.Thehotliquidrockmovingdownthevolcanoburnseverythingandanythinginitsway.Fromthefirstflickerofflameindrygrass,a
wildfirespreadsrapidlyacrossthecountryside.Flamesjumpfromtreetotreeandburningashesflyaround,burningmoreplants,whileterrifiedanimalsfleefromtheoncomingflames.Alsoknownasforestfires,wildfiresarea
regulardisasterduringthelong,drysummersintheforestsofAmerica,Europe,ChinaandAustralia.Tsunamis(soo-nah-mee)
arecausedbymassiveshiftsofwater,usuallyduetomovementsoftheseafloorthatgowithunderseaearthquakes.Theyarethedeadliestofallwaves.Theycantravelatspeedsof950km/hand,whentheyreachtheshore,theycanbeashighas30m.Massivewallsofwatercanslamagainstthecoast,tearinguptrees,floodingfieldsanddestroyingtownsandvillages.Waterisvitaltosurvival—fordrinking,washing,andgrowingcrops.Riversandseasprovidefoodandtransportation.Butwhena
riverburstsitsbanks,orhugestormwavessweepinfromthesea,waterbecomesa
deadlyenemy——flood,adeadlysurgeofwaterthatrisessorapidlythatitcancatchpeoplecompletelyunprepared.Theforceoffloodcansweepawaypeopleandanimals,anddestroybuildings.Platesmovingundergroundcancauseanasuddenshakingearthquake,
whichis___________________oftheearth’ssurface.Earthquakesaremostcommonwhereplatesmeet.Severalmillionsmallearthquakeshappeneveryyear,butmostdonotcauseanydamage.Seriousearthquakes,however,candestroyentirecities.A
largeamountof__e_a_r_t_h__a_n__d_r_o_
_c_k__fallingdowna
hillormountainiscalledalandslide.
Landslidesareoftencausedbyheavyrainfall,earthquakes,volcaniceruptionsorothernaturaldisasters.Sometimestheyarealsocausedbyhumanactivitiessuchascuttingdownforest
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