The only event the Time Almanac has listed under 4.5 billion B.C. is this "formed"
These assumptions were listed in the previous chapter together with 
some ... that the half-life of the parent uranium 238 is said to be 4.5 billion years, 
then a .... Once formed, the radioactive C14 atoms begin to decay by emitting 
beta... [DOC] [TLE] Human Influences on Weather and Climate - Dictionary definition of ... [PAR] This activity has wide-ranging results, such as increasing the temperature of the 
... in the United States triggered by air pollution are between $40 and $50 billion.