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JinCull,GraemeBcardsmore,Dept.EarthScienas,MonashUnivcrsity,Vic’3l68Australin’Theheatwliichnowsfromtheearth’ssurfaceisdcrivcdfromacombinationofsevcralbcatsources’Thetwomaj0rs0urccs0fc0nductedhcatoverc0ntinentalcrustarctheco01ingofmantle,andthedecay0fradi0