火山爆发ppt

volcanoeruptionWhatisvolcano?Somewordsaboutvolcano：activevolcano活火山extinctvolcano死火山volcanicash火山灰reawaken再度觉醒volcanologist火山学家rock-magma岩浆crustalmovement地壳运动lavaflow熔岩流VolcanicExplosivityIndex火山爆发指数AvolcanoisaplaceontheEarth‘ssurface(oranyotherplanet’sormoon‘ssurface)wheremoltenrock,gasesandpyroclasticdebris（火山碎屑）eruptthroughtheearth'scrust.Volcanicclassification1.activevolcano(活火山)2.extinctvolcano（死火山）3.dormantvolcano（休眠火山）Eruptiontype1.Quieteruption（宁静式喷发）2.Blastingfiercetypeeruption（爆烈式喷发）3.Middletypeeruption（中间式喷发）Volcaniceruptionishowcreates?Originally,theinterioroftheearthfilledwithhotmagma.Undertremendouspressure,fromweakmagmawillbreakthroughtheearth'scrustand,wherespoutedout,causingthevolcano.•Thispictureshowustheprocessabouttheformingofvolcano.Partthree:Severalbigactivevolcanosintheworld1.TheLaki(拉基)volcanoinIceland2.Kilauea（基拉维厄）Volcano3.MaunaLoa(冒纳罗亚)volcano4.Vesuvius(维苏威)Volcano5.MountStHelen's(圣海伦斯)volcano6.MonteEtna(埃特纳)volcano7.Sangay(桑盖)NationalParkvolcanotheharmsandbenefitsofvolcanoHarm1.Causegreatbadimpactontheglobalclimate2.Ashandrainmixedformmudslides（泥石流）3.ashcancauserespiratorydiseases（呼吸道疾病）1.manyofthevolcanicmaterialshaveimportantindustrialandchemicaluses.2.Volcanicashthathasbeenweathered(风化)greatlyimprovessoilfertility.BenefitsAlthoughthevolcanoeruptionsareterrible,butcanalsobeverybeautifulHowtoprotectyourselfinthevolcanoeruption?•TheonlywayGowhilethegoingisgood.(三十六计，走为上计。)