Show Heres Here's Another Stab at I Age of Mother Earth One of ot the most remarkable discoveries dIscoverIes discoveries dis dIs- of recent years ears Is the radioactive radIoactive radio radIo- radioactive active met metal l uranium which gradually gradually ally changes into lead says LondonI London I Tit Bits The rate at which this thIs' process Is carried out Is well known i and it Is Invariable By taking rocks I which contain both uranium and lead and finding the proportion of at each metal now existing In them the length of ot time necessary to bring about the present state of ot affairs Is i not difficult to calculate Such a j calculation shows that the earn must have been solid not far short of two thousand million ye years rs ago The paths of the earth around th the sun and find the moon around the th earth are not ot what they were originally Science can reconstruct them and discover the time needed to give them their present shapes All of these methods show that the age of the earth must must- be more than one thousand million years and less lesi than four thousand million years We Ve shall then not be far wrong 11 it we fix the earths earth's birthday at about two thousand million years ago |