RoineMagnusson/StoneTheNatureofMatterThispancakeicehasformedonariverinSweden.Pancakeiceformswhensurfaceslush,arisingfromsnowfallingonwaterthatisalreadyatthefreezingtemperature,freezes.Thesurfaceslushcollectsintoroundedfloatingpadsthatcol-lideandseparate.Sendallinquiriesto:Glencoe/McGraw-Hill8787OrionPlaceColumbus,OH43240-4027ISBN:0-07-861765-0PrintedintheUnitedStatesofAmerica.2345678910027/111090807060504Copyright©2005byTheMcGraw-HillCompanies,Inc.Allrightsreserved.ExceptaspermittedundertheUnitedStatesCopyrightAct,nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutpriorwrittenpermissionofthepublisher.TheNationalGeographicfeaturesweredesignedanddevelopedbytheNationalGeographicSociety’sEducationDivision.Copyright©NationalGeographicSociety.Thename“NationalGeographicSociety”andtheYellowBorderRectanglearetrademarksoftheSociety,andtheiruse,withoutpriorwrittenpermission,isstrictlyprohibited.The“ScienceandSociety”andthe“ScienceandHistory”featuresthatappearinthisbookweredesignedanddevelopedbyTIMESchoolPublishing,adivisionofTIMEMagazine.TIMEandtheredborderaretrademarksofTimeInc.Allrightsreserved.RoineMagnusson/StoneCONSULTANTSJackCooperEnnisHighSchoolEnnis,TXLindaMcGawScienceProgramCoordinatorAdvancedPlacementStrategies,Inc.Dallas,TXMATHMichaelHopper,DEngManagerofAircraftCertificationL-3CommunicationsGreenville,TXREADINGBarryBartoSpecialEducationTeacherJohnF.KennedyElementaryManistee,MISAFETYAileenDuc,PhDScience8TeacherHendrickMiddleSchool,PlanoISDPlano,TXSandraWest,PhDDepartmentofBiologyTexasStateUniversity-SanMarcosSanMarcos,TXACTIVITYTESTERSNermaCoatsHendersonPickeringtonLakeviewJr.HighSchoolPickerington,OHMaryHelenMariscal-CholkaWilliamD.SliderMiddleSchoolElPaso,TXScienceKitandBorealLaboratoriesTonawanda,NYK◆iiiAuthorsSeriesConsultantsSharlaAdamsIPCTeacherAllenHighSchoolAllen,TXAnthonyJ.DiSipio,Jr.8thGradeScienceOctoranaMiddleSchoolAtglen,PASandraEverhartDauphin/EnterpriseJr.HighSchoolsEnterpri...
