byDaphneGreavesË|xHSKBPDy502705zv*:+:!:+:!>ISBN-13:978-0-15-350270-5ISBN-10:0-15-350270-3GRADE4Lesson30WORDCOUNT926GENREExpositoryNonfictionLEVELELLHarcourtLeveledReadersOnlineDatabasebyDaphneGreavesCover,©JeffHunter/Photographer’sChoice/GettyImages;p.3,©PhotoDisc;p.4–5,©ErnestManewal/INDEXSTOCKIMAGERY;p.6,©JulieHouck/CORBIS;p.7,p.9,©Corel;p.8,©BruceClarke/IndexStock;p.10,©DouglasPeebles/CORBIS;p.11,©AWitte/CMahaney/Stone/GettyImages;p.12–13,©StephenFrink/CORBIS;p.14,©Corbis.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.PrintedinChinaISBN10:0-15-350270-3ISBN13:978-0-15-350270-5OrderingOptionsISBN10:0-15-349939-7(Grade4ELLCollection)ISBN13:978-0-15-349939-5(Grade4ELLCollection)ISBN10:0-15-357303-1(packageof5)ISBN13:978-0-15-357303-3(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891098512111009080706Imagineyourselfswimmingdeepunderthewater.Watchthecolorfulfishswimbesideyou.Seeamazingcoralreefs.Searchsunkenshipsforlosttreasure.Thesethingsarepossibleifyouareascubadiver.Scubadiversexplorethedeepwatersofoceans,lakes,andrivers.3Howdoscubadiversexplore?Scubadiversusespecialequipmentthatletsthembreatheunderwater.Diverscarrytanksontheirbacks.Thetanksarefilledwithair.Hosesattachedtotheta...
