Geologic Age Dating Explained - Kids Discover
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The dinosaur is called superus awesomus. Paul says he can tell from the fossils that superus awesomus lived on Earth about million years ago.
What is relative dating | Ferias de Empleo
Paul is super awesome, so I'm going to take him at his word. But really, how do scientists figure out how old their dinosaur bones are? And, what about other findings like fossil fish, plants and insects? Scientists are always spouting information about the ages of rocks and fossils.
How do they know these ages? Well, they figure it out using two different methods: Let's find out more about these geological dating methods in order to understand how Paul the Paleontologist can be so sure about the age of his dinosaur fossils.
Relative Dating The first method that scientists use to determine the age of rocks is relative dating. In this method, scientists compare different layers of rock to determine an ordered sequence of events in geologic history.
That means they don't really know how old their rocks actually are. The key in relative dating is to find an ordered sequence. Scientists piece together a story of how one event came before or after another. Relative dating cannot tell us the actual age of a rock; it can only tell us whether one rock is older or younger than another.
Not all rocks have radioactive elements. Sedimentary rocks in particular are notoriously radioactive-free zones.
So to date those, geologists look for layers like volcanic ash that might be sandwiched between the sedimentary layers, and that tend to have radioactive elements. You might have noticed that many of the oldest age dates come from a mineral called zircon. Each radioactive isotope works best for particular applications.
The half-life of carbon 14, for example, is 5, years. On the other hand, the half-life of the isotope potassium 40 as it decays to argon is 1.
Chart of a few different isotope half lifes: If a rock has been partially melted, or otherwise metamorphosed, that causes complications for radiometric absolute age dating as well. Good overview as relates to the Grand Canyon: Which are the youngest? I also like this simple exercise, a spin-off from an activity described on the USGS site above. Take students on a neighborhood walk and see what you can observe about age dates around you.
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Methods of Geological Dating: Numerical and Relative Dating
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