介绍火山喷发(英语).ppt

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1、Howmuchdoyouknowaboutvolcanoeruption(火山喷发)?————2009011219李亮Partone：whatisvolcano?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volcanoAvolcanoisaplace

2、ontheEarth‘ssurface(oranyotherplanet’sormoon‘ssurface)wheremoltenrock,gasesandpyroclasticdebris（火山碎屑）eruptthroughtheearth'scrust.Volcanicclassificationactivevolcano(活火山)extinctvolcano（死火山）dormantvolcano（休眠火山）EruptiontypeQuieteruption（宁静式喷发）Blastingfiercetypeeruption（爆烈式喷发）Midd

3、letypeeruption（中间式喷发）Parttwo:Volcaniceruptionishowcreates?Originally,theinterioroftheearthfilledwithhotmagma.Undertremendouspressure,fromweakmagmawillbreakthroughtheearth'scrustand,wherespoutedout,causingthevolcano.Thispictureshowustheprocessabouttheformingofvolcano.Partthree:

4、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)NationalParkvolcanoPartfour:theharmsandbenefitsofvolcanoHarm1.Causegreatbadimpacton

5、theglobalclimate2.Ashandrainmixedformmudslides（泥石流）3.ashcancauserespiratorydiseases（呼吸道疾病）manyofthevolcanicmaterialshaveimportantindustrialandchemicaluses.2.Volcanicashthathasbeenweathered(风化)greatlyimprovessoilfertility.BenefitsPartfive:howtoprotectyourselfinthevolcanoeruptio

6、n?TheonlywayGowhilethegoingisgood.(三十六计，走为上计。)Thankyouforyourwatching!