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1、GeologicJourney:AfricanRift地質(zhì)之旅－東非裂谷TheGreatRiftValley.Thingshavehappenedherethathappennowhereelse.That’stheunderlyingtruthtothisplace.Withinitswalls,ourspeciesevolved,civilizationsroseandcollapsed.Andthere’sanevenbiggerdramaatplay.Thebirthanddeathofoceans.It’sallduetotheimpactoftectonics.Geologi
2、stNickEylesisonaquesttoexploreitspower.FromthecradleofhumanitytothehottestplaceonEarth,totheruinsoftheoldestcivilizationsandthebedrockofsomeoftheworld’smodernreligions-ajourneyalongtheRift.There’ssomethingprimevalbeingupthereandlookingdownintothedepthsoftheEarth.Holycow!It’sanabsolutelyfantastice
3、xperience.Notjustasascientist,butasahumanbeing.ThisistheEastAfricanRift,onepartoftheGreatRiftValleythatstretchesfromMozambiquetoTurkey.It’saspecialplaceforhumankind.Embeddedinthesecliffs,packedbetweenlayersofvolcanicash,isthestoryofourorigin.TheRiftsystemisournaturalhome,asitwere.That’swherehuman
4、sevolved.Wedevelopedinassociationwithvolcanoesandfaults,earthquakes.Soit’sagreatviewofwhereweoriginated.Thewholelandscapeiscoveredwithgreatthicknessesofash,whichisagoodthingbecausethoseashlayersentombtheremainsofearlyhumansandtheirancestorsandtheyprovideprecisemarkerhorizonsoftime.EversinceDarwin
5、suggestedthathumanssharecommonancestorswithAfricanapes,scientistshavesearchedforfurtherclues.Theonlyplacetheyfoundfossilsthatlinkdirectlytomodernhumansisinthislong,narrowvalley.Theintriguingquestioniswhy.CanadiangeologistNickEylesseekstounderstandhowhumanhistoryislinkedtothegeologyoftheGreatRiftV
6、alley.HebeginshisjourneyinKenyatoexplorethetheorythattheRiftwasthecatalystforhumanevolution.HemeetsGermangeologistMartinTrauth.Trauthhasspenthiscareerdatingsedimentsandcross-referencingthemwithevolutionarychanges.He’sconcludedthateachstepinourevolutioncoincidedwiththeappearanceordisappearanceofla
7、rgelakesintheRiftbasin.Ifyouhavemajoreventsinhumanevolutionoccurringatthetimewherewehavelargelakeseverywhere,that’sprobablyanevidenceforthatthereshouldbealinkbetweenclimate,environmentalchangesandtheevolutionofearlyhum
