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1、Naturaldisasters——volcaniceruption2110915448邱银NaturaldisastersNaturaldisastersareabnormalphenomenonofthenature,thedamageisoftenshocking.Suchasearthquake,volcaniceruption,landslides（滑坡）,tsunamis（海啸）,typhoon(台风),flood,etc.Theywillcausegreatdamagetohumanlifeandproperty.Themagma（岩浆）oftheinnerear
2、theruptsoutofthesurface,andthenaccumulates,whichmakesofvolcano.Itcanbedividedintotwokinds——extinctvolcano（死火山）andactivevolcano（活火山）.volcanoweknowthenumberoftheextinctvolcanois2000,andthenumberofactivevolcanois523,andtheyare455locatedintheland,68intheseabed.VolcanoonEarthisnotuniform,andtheya
3、llappearinthefaultzone（断裂带）ofthecrust.美国奥古斯丁火山WecanseethevolcanicareasmainlylocatedintheedgeofthePacific,Indonesia(印度尼西亚),theHimalayas(喜马拉雅山脉)andtheMediterranean（地中海）,Wherethedistributionofthe80percentoftheactivevolcanoes.Volcanicactivitycanemitavarietyofsubstances,andifthejetofgassubstances
4、aremorepronetoexplosion.Ejecta(喷出物)areinsolid,liquid,gasandradioactivesubstances,etc..animalandplant.DisadvantageVolcaniceruptionstendtocausefireandmudflows,floodingvastareas,washingawayanybuilding,killingpeople,propertydamaged,endangeringlifeofthehuman,AdvantageHowever,volcaniceruptionsaren
5、otallbad:theuniquevolcanicgeologyandtopography,post-volcanicgeothermal,hotsprings,isoftenbecometouristresort,fertilevolcanicsoilisconducivetoagriculturalproduction.Continuousvolcaniceruptionscanformthemainland,suchasHawaiiandIceland,etc…Iceland'svolcaniceruptionstartedOnthe14thofthismonth,ti
6、llnowhastendedtoease.Itisreportedthatthiseruptionmayseemscary,butonlymoderatelevelsofvolcaniceruptionsarerelativelynotverydeepimpact,andpeoplehavereturnedtonormallife.Astheeruptionproducealargenumberofvolcanicash,causingchaosintheEuropeanairtransportation,theaviationindustryalonelostclosetot
7、wobilliondollars,Butfortunatelythereisnottoomuchdamageinpropertyandpeople'slife.Theashandgasofthevolcaniceruptionisharmfultohuman,whichwillgonewithwind,awidescopewillbeaffected.Recently,therearemanyrumorssayingthatChina'sacidrainissubjecttoitsinflu
