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How can you compare your wisdom to geological timing?

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but don’t even mention the fact that we can’t measure the concentrations of isotopes in the past.

So, the fatal problem with all radioactive dates is that they are all based on assumptions about the past.

But the basic concept of radioactive dating, sometimes called radiometric dating, is not difficult, especially since all of us regularly calculate how much time has passed: for example, since our birth, or since we started on a walk.

A swimming race is a familiar situation that illustrates the simple principles involved in measuring time.

You could describe the atomic workings of the quartz oscillator and how it resonates at a specific and highly stable frequency, and how this is used to accurately pace a timekeeping mechanism.

The fact is that you can only establish the time for the race if it was timed by two or more reliable eyewitnesses who observed the you cannot measure the age of a rock using radioactive dating because no-one was present to measure the radioactive elements when the rock formed and no-one monitored the way those elements changed over its entire geological history This illustrates the problem with the radioactive dating of geological events.Many people assume that the dates scientists quote of millions of years are as reliable as our knowledge of the structure of the atom or nuclear power.And radioactive dating is so shrouded with mystery that many don’t even try to understand how the method works; they just believe it must be right.The educational page hosted by the US Geological Society provides one recent example of the way radioactive dating is explained to the public.They focus on the technicalities of radioactive decay, etc.Next time you see dates quoted of millions of years remember that the numbers are not scientific measurements of time elapsed.

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