A plot is constructed of Pb-206/Pb-204 versus Pb-207/Pb-204.If the solar system formed from a common pool of matter, which was uniformly distributed in terms of Pb isotope ratios, then the initial plots for all objects from that pool of matter would fall on a single point.he generally accepted age for the Earth and the rest of the solar system is about 4.55 billion years (plus or minus about 1%).This value is derived from several different lines of evidence.
Without these observations you cannot be sure that the time is valid.
When I have asked an audience this question they have looked at me incredulously and said, “Starting time?
” You cannot know how long the swimmer took unless you knew the time on the wristwatch when the race started.
We note that at the instant the swimmer touches the edge of the pool our wristwatch reads and 53 seconds.
How long has the competitor taken to swim the 1,500 metre race?
But without reliable witnesses the accuracy of the watch makes no difference.