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02-Nov-2019 01:23

You would need to have access to scientific instruments at this point that could measure the amount of radioactivity in the sample, so off to the lab we go!After you prepare your sample and put it into the machine, your readout says you have approximately 75% Nitrogen-14 and 25% Carbon-14.If any of the fossils are unique to one of the geologic time periods, then the rock was formed during that particular time period. But these two methods only give the relative age of rocks--which are younger and which are older. Or how do we know how long ago a particular group of fossilized creatures lived?The age of a rock in years is called its absolute age.This technique relies on the property of half-life.Half-life is defined as the time it takes for one-half of a radioactive element to decay into a daughter isotope.This is what your readout said, so your fossil has undergone two half-lives.

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The age of the rock in years can be found by measuring the rate at which a parent element decays and then measuring the ratio of parent element to daughter element in the rock.As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope.By measuring the ratio of the amount of the original radioactive element to the daughter isotope, scientists can determine how many half-lives the element has undergone and from there can figure out the absolute age of the sample.Perhaps the most widely used evidence for the theory of evolution through natural selection is the fossil record.

The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record.A common "parent-daughter" combination that geologists use is radioactive uranium and non-radioactive lead.

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