Radioisotope dating kids

To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.So if scientists wanted to measure the age of a fossil using this method, they would look for a nearby layer of igneous rock (e.g.

After examining the assumptions behind this ‘dating method’, and doing scientific experiments to see if this method works on rocks of an already known age, we find that ‘radiometric dating’ isn’t all it’s cracked up to be.Relative age dating also means paying attention to crosscutting relationships.Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.After all, the scientists haven’t been around that long, have they?There are a variety of different ways to figure out how old an object is.

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