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1、i-01-LBF-8617498/23/0410:50AMPageiPhotoDisci-01-LBF-8617498/23/0410:50AMPageiiEarthMaterialsandProcessesTheeruptioncolumnaboveMountSt.Helens,Washington,asitexplodedonMay18,1980,rosethousandsoffeetskywardanddrifteddown-wind,dumpingdark,grayashovereasternWashingtonandbeyond.Theeruptio
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5、w-Hill8787OrionPlaceColumbus,OH43240-4027ISBN:0-07-861749-9PrintedintheUnitedStatesofAmerica.2345678910027/043090807060504PhotoDisci-01-LBF-8617498/23/0410:51AMPageiiiAuthorsRalphM.FeatherJr.,PhDDinahZikeAssistantProfessorEducationalConsultantEducationDivisionGeoscienceDepartmentDin
6、ah-MightActivities,Inc.Washington,D.C.IndianaUniversityofPennsylvaniaSanAntonio,TXIndiana,PASeriesConsultantsCONTENTWilliamC.Keel,PhDTeriWillard,EdDSandraWest,PhDDepartmentofPhysicsandMathematicsCurriculumWriterDepartmentofBiologyAstronomyBelgrade,MTTexasStateUniversity-SanMarcosUni
7、versityofAlabamaSanMarcos,TXTuscaloosa,ALREADINGACTIVITYTESTERSRobertNiersteCarolA.Senf,PhDScienceDepartmentHeadSchoolofLiterature,NermaCoatsHendersonHendrickMiddleSchool,PlanoISDCommunication,andCulturePickeringtonLakeviewJr.HighPlano,TXGeorgiaInstituteofTechnologySchoolAtlanta,GAP
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