【地质专业英语文选】下集 - 印书馆北京.pdf
地质专业英语文选 下册 南京大学外文系公共英语教研室编 商务印书馆 1979年北京
CONTENTS 31.TheAge of theEarth 32.Continental Drift 33.Global Plate Tectonics34.Glaciers35.Ground Water36.Movement of Subsurface Water37.Stream Processes38.Alluvial Fans and Deltas39.TurbidityCurrents andDeposits40.Dikes,Sills,and Batholiths41.
31.THEAGEOFTHEEARTH Manyscientistshaveestimatedtheageof theearth,start- ingfromvariouspostulates,butfailedtodetermineitcorrectly because of false startingpremises.The way tomore realistic vity.A few elements,among them uranium and thorium, spontaneouslydisintegrateintolighterelementsbychanges 
