byMichaelSandlerTHEARCTICOCEANAChangingSeaTHEARCTICOCEANAChangingSeabyMichaelSandlerCover,©PaulNicklen/NationalGeographicImageCollection;p.3,©JohnDunn/ArticLight/NationalGeographicImageCollection;p.4(cl),©UniversityofWashington;p.4–5,©TuiDeRoy/MindenPictures;p.6,©JohnDunn/ArticLight/NationalGeographicSociety;p.7,©ChristianDarkin/SciencePhotoLibrary/PhotoResearchers;p.8–9,©GordonWiltsie/NationalGeographic/GettyImages;p.9(tr),©DominiqueBraud/AnimalsAnimals;p.10–11,©epa/Corbis;p.12(tr),©StaffanWidstrand/CORBIS;p.12–13,©ArcticPhoto;p.14,©QuingZhang/NOAA.Copyright©byHarcourt,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopy,recording,oranyinformationstorageandretrievalsystem,withoutpermissioninwritingfromthepublisher.RequestsforpermissiontomakecopiesofanypartoftheworkshouldbeaddressedtoSchoolPermissionsandCopyrights,Harcourt,Inc.,6277SeaHarborDrive,Orlando,Florida32887–6777.Fax:407-345-2418.HARCOURTandtheHarcourtLogoaretrademarksofHarcourt,Inc.,registeredintheUnitedStatesofAmericaand/orotherjurisdictions.PrintedintheUnitedStatesofAmericaISBN10:0-15-350549-4ISBN13:978-0-15-350549-2OrderingOptionsISBN10:0-15-350335-1(Grade5Below-LevelCollection)ISBN13:978-0-15-350335-1(Grade5Below-LevelCollection)ISBN10:0-15-357548-4(packageof5)ISBN13:978-0-15-357548-8(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.12345678910179121110090807063Canyouwalkacrosstheocean?Itseemslikeasillyquestion.There’soneocean,theArcticOcean,wheredoingsoispossible.However,itmaynotbethatwayforever.TheArcticOceansurroundstheNorthPoleatthetopoftheworld.TheArcticOceanisthesmallestoftheworld’soceans.Unlikeothers,muchofitiscoveredw...
