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Definition of relative age dating

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As radioactive isotopes of elements decay, they lose their radio activity 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.

One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.

Also called absolute dating, scientists use the decay of radioactive elements within the fossils or the rocks around the fossils to determine the age of the organism that was preserved.

Lateral continuity: The principle of lateral continuity states that sediments generally accumulate in continuous sheets within a given region.

If today you find a sedimentary layer cut by a canyon, then you can assume that the layer once spanned the area that was later eroded by the river that formed the canyon.

Law of Superposition: The principle of superposition states that in a sequence of sedimentary rock layers, each layer must be younger than the one below, for a layer of sediment cannot accumulate unless there is already a substrate on which it can collect.

Because of the overwhelming amount of evidence growing in many professional sports today, many athletic development experts now believe birth date plays a huge role in determining who succeeds and who fails. This effect was coined by the sociologist, Robert Merton, who named it after the bible passage Matthew .So, let's imagine for a second that you have a 3-layered cake. So, by definition, the oldest layer of cake would be chocolate, as it was put there first. Now all of a sudden the big tower of cookies running through the middle of your cake is the youngest feature, as the other three layers in order for it to be there.Your 3 layers will consist of a chocolate cake, a vanilla cake, and a cheesecake, because you're crazy and your cake doesn't have to conform to standards. On your plate, you put the chocolate cake on bottom, or the first layer. Then vanilla and cheesecake are the second and third oldest, respectively. Now that I've gotten you all hungry for cake and cookies let's talk about rocks instead.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.Perhaps the most widely used evidence for the Theory of Evolution through Natural Selection is the fossil record.