内容提要：美国著名火山圣海伦斯的喷发。
For63years,novolcano火山erupted喷发inthe48connectedUnitedStates.ThenonMay18,,MountSt.Helens,insouthwesternWashington,blasted爆炸awaythetop1,feetofitssnow-coveredcrest顶部.Scalding滚烫的gases,steam,fire-hotrocks,andtruck-sizedboulders大圆石flewoutofthemountainatmilesanhour.Nearbyforestswereuprooted连根拔起,shredded撕碎,andblownawaybywindsofhurricaneforce.Over2millionbirds,fish,andanimalsdiedintheexplosion.Twenty-sixlakesweredestroyed.Mudflows泥流coveredorcrushedoverhousesandcabins.Altogether,squaremilesoflandwereaffected.
Althoughsmallplumes羽状物ofsteamandashhad
