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And you have to check to make sure he touches the edge at the end of each lap.

Without these observations you cannot be sure that the time is valid.

Radiometric dating methods are the strongest direct evidence that geologists have for the age of the Earth.

When I first became interested in the creation-evolution debate, in late 1994, I looked around for sources that clearly and simply explained what radiometric dating is and why young-Earth creationists are driven to discredit it.

I found several good sources, but none that seemed both complete enough to stand alone and simple enough for a nongeologist to understand them.

Thus this essay, which is my attempt at producing such a source.

This amount is often unknown and is one of the downfalls of conventional radiometric dating.

However, isochron dating bypasses this assumption, as explained below. The final condition is the number of atoms of parent and daughter isotopes remaining in the rock and can easily be measured in a lab.

During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.Contents: The half-life of a radioactive isotope is defined as the time it takes half of a sample of the element to decay.A mathematical formula can be used to calculate the half-life from the number of breakdowns per second in a sample of the isotope.Then the computed age based on the accumulation of daughter products will be incorrect (Stasson 1998).In order to use the valuable information provided by radiometric dating, a new method had to be created that would determine an accurate date and validate the assumptions of radiometric dating. Isotope dating satisfies this requirement, as daughter products do not decay back to the original parent element.

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