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Forseveralbillionyearsafterthe“BigBang”,theearthwassti...
问题详情: Forseveralbillionyearsafterthe“BigBang”,theearthwasstilljustacloudofdust.Whatitwasto______(36)wasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.Theearthbeca...