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1、BBCLEARNINGENGLISH6MinuteEnglishTheEarth'scoreNB:Thisisnotaword-for-wordtranscriptRobHelloandwelcometo6MinuteEnglish.I'mRob…Alice…andI'mAlice.Hello.RobHithere,Alice!Now,haveyoureadanybooksbyJulesVerne?AliceYes,Ihave.JourneytotheCentreoftheEarthwasmyfavouritebookasachild!AGermanProfessorandhistw
2、ocompanionsclimbdownavolcanoinsearchoftheEarth'scentre–orcore.Theyvisitstrangelandsinhabitedbydinosaursandgiantprehistorichumans,andsailacrossanundergroundocean.RobHmm.Veryexcitingbutitdoesn'tsoundveryrealistic.Howdotheygetoutagain?AliceWell,theyshoottothesurfacefromthemouthofMountEtnaduringavo
3、lcaniceruption.RobWow!Thatsoundsveryuncomfortable!Well,ontoday'sshowwe'regoingtodiscusswhatscientistsreallyknowabouttheEarth'score.AliceYes.TheEarthhasadenseinnercoresurroundedbyafluidoutercore.Dense,bytheway,meansheavyinrelationtoitssize.But,Rob,I'vegotaquestionforyouasusual:howbigdoyouthinkth
4、einnercoreis?Isitthesizeof…a)theMoon?b)Jupiter?orc)Mars?6MinuteEnglish©BritishBroadcastingCorporation2015bbclearningenglish.comPage1of5RobRight!Well,Ihaven'tacluetobehonestsoI'mgoingtotakeaguessandsayc)Mars.AliceWell,we'llfindoutlateronintheshowifyou'reright.Butbeforewegetthere,let'sfindoutabit
5、moreaboutwhattheEarthismadeof.RobWell,theEarthhaslayers,abitlikeanonion.AliceIlikeyourtechnicallanguage,Rob!RobButI'mtryingtokeepthingssimpleforyou,Alice!AliceThanks.RobIthasathinouterlayerorcrustwherewelive.Andthisincludesourcontinentsandtheoceanfloors.Thenbeneaththatthere'sanotherlayercalledt
6、hemantle.Andbeneaththat,istheEarth'score–over6000kmbelowthesurface.AliceRight.Butwhat'stheEarthmadeof,Rob?RobIt'sagoodquestion.Anditdependsonwhichlayeryou'retalkingabout!Thecrustandmantlearerockandcontainalotofsilicate–whichisthesamestuffthatglassismadeof.Buttheouterandinnerpartsofthecoremainly
7、consistofiron.AliceAndthecoreisveryhot.AmIright?RobYouareindeed.Theprofessorandhiscompanionswouldn'thavesurvivedverylongdownthere!Theoutercoreisaswirlingmassofmolten–orliquid–metalandit'sashotasthesurfaceoftheSun!AliceWow!Thatmust
