Let’sLookforLet’sLookforFossilsFossilsCover©Photolibrary.com/DavidCayless;3©Photolibrary.com/DavidRFrazier;4©Photolibrary.com/GeorgeBernard;5©Photolibrary.com/DavidCayless;6©Photolibrary.com/SinclairStammers;7©GettyImages/LouiePsihoyos;8©Photolibrary.com/SinclairStammers;9©Photolibrary.com/MauroFermariello;10©Photolibrary.com/SinclairStammers;11©GettyImages;12©BreckP.Kent;13©Photolibrary.com/GerardSoury;14©GettyImages/VanessaBerberion.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.PrintedinMexicoISBN10:0-15-351436-1ISBN13:978-0-15-351436-4OrderingOptionsISBN10:0-15-351212-1(Grade2AdvancedCollection)ISBN13:978-0-15-351212-4(Grade2AdvancedCollection)ISBN10:0-15-358071-2(packageof5)ISBN13:978-0-15-358071-0(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891005015141312111009080706byAinslieMitchell3Fossilsarecluestothepastthatlastalongtime.Afossilmighthavebeenafishorashell,aboneorafootprint.Thelargestfossilstogethermaymakeupawholedinosaurskeleton!Haveyouthoughtabouthowalltheselivingthingscametobefossils?8Bonesthathavebecomefossilsaregreatclues.Byfittingthebonestogether,scientistscanworkoutthesizeandshapeofananimal.Evenonefossiltooththathasbeenseparatedfromtheotherpartsoftheanimalisagoodclue.Ascientistmaybeabletofigureoutthesizeofasharkfromonlyoneofitsteeth.Asharktoothfossil9Fossilcluesarehowscientistscantellusallaboutdinosaursthatlivedlongago.Ofcourse,scientistshaveneverseenanylivedinosaurs,buttheyhavediscoveredallsortsofthingsaboutthembystudyingdinosaurfossils.10Itisnotcommon,butfossileggshavebeenfoundstillintheirnest!Scientistscandiscoveralotfromtheeggs.Theycanevenlookinsidetheeggsatthebabyanimalfossils.Dinosaureggfossils11Somefossilsareverysmallandcanonlybeseenunderamicroscope.Theyarecalledmicrofossils.Microfossilsasseenunderamicroscope14Ifyouareinaplacewheretherearerocks,checkthemout!Youneverknowwhenyoumightfindafossil.Suddenly,youcouldbeholdinginyourhandanexcitingcluetooneoftheearth’ssecrets!
