Relative age dating vs radiometric dating

So, we typically use relative dating to come up with a ballpark and then use numerical dating for special items like fossils.

One of the biggest jobs of a geologist is establishing the absolute age, in years, of a rock or fossil.Unlike relative dating, which only tells us the age of rock A compared to rock B, numerical dating tells us the age of rock A in x number of years.If I told you that I was 85 years old, that number would be my numerical age.Initially, the students are asked to develop physical clues to put themselves in order from to oldest (exposing the inferences we make unconsciously about people s ages), and this will be refined/modified using a list of current events from an appropriate historical period that more and more of the students will remember, depending on their age (among other variables).Absolute age is introduced by having the students order themselves by birth decade, year, month, and day, and comparing the absolute age order to the order worked out in the relative-dating exercise, with a discussion of dating precision and accuracy.

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