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1、IntroducingPlanetEarthPresentedByNameLetmeintroducemyself.IamPlanetEarth.Iamtheluckiestplanetinoursolarsystem(太阳系).Icansupportlife!LookatMercurysoclosetotheSun.Hot,hot,hot.Evenoneofmydesertratscouldnotliveinthatheat!ColddwarfplanetPluto(冥王星)sitssofarfromtheSun.Brrrr.Howwoul
2、dyouliketobeafrozenPopsiclePlanet?Notme.Ihaveallthethingslifeneeds—land,water,air,andenergyfromtheSun.Ihavefouroceansandsevenhugepiecesoflandcalledcontinents(大陆).Onland,Ievenhavelakesandriversfilledwithfreshwaterthatplantsandanimalsneed.Ispinlikeatop(陀螺)sothatalllivingthing
3、shavedayandnight.Peoplecallthisrotating(自转).BecauseIamroundlikeaball,sunlighthitsmeunevenly(不均匀地).Thismakespartsofmehotandpartsofcold.Myfatbellygetsthemostdirectsunlight,soitishottestalongmybelt.Thisareaiscalledtheequator(赤道).MyNorthandSouthPolesgettheleastdirectsunlight.Th
4、eSun’sraysareweakerherethanatmyequator.Theseareasaremycoldest.Whetherit’shot,cold,orinbetween,creatureslivealloverme.Peopleliveonallmycontinents(大陆);afewevenlivearoundtheSouthPoleinAntarctica(南极洲).Mostpeopleliveinmymilder(更温暖的)partswheretheycanbuildhomesandgrowcrops.Peoplet
5、ravelallovermyplanet.Longago,peoplegotlostwhensailingacrossmyoceans.Theyneededawaytoidentifylocations(确定方位).Sotheyinventedaglobalgrid(网格),orlinesthatcrosseachothertoformpointsanywhereonEarth.Thelinesthatrunnorthandsoutharelongitudelines(经线).Thelinesrunningeastandwestarelati
6、tudelines(纬线).Thisgrid(网格)tellspeoplewheretheyare.Oh,Ialmostforgot.Iamtilted(倾斜),too.AsItravelaroundtheSunduringmyyearlongtrip,Istayinmytilt.SometimesItilt(倾斜)towardtheSun,andsome-timesawayfromit.Mytiltcreatesseasons.InJanuary,mytophalf,ornorthernhalf,istiltedawayfromtheSun
7、.That’swinterwhenchildreninthenorthernhalfgosledding(去玩雪橇).Atthesametime,thesouthernhalfispointedtowardtheSun.It’ssummerthere.WhenIgethalfwayaroundtheSunandit’sJuly,I’mstilltilted.Butthistime,mynorthernhalfistiltedtowardtheSun,andit’ssummer.Mysouthernhalfispointedawayfromth
8、eSun,andit’swinterthere.Iamafairplanet.Igiveeachofmyhalvesseasonsandequalamountsof
