# 21.3 absolute age dating of rocks

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&#x20;[![View](https://i.imgur.com/40gzyyG.png)](http://bit.ly/FastDating18) <br>

The longest cores have helped to form a record of polar climate stretching hundreds of thousands of years back. Explain how scientists use correlation to understand the history of a region.\
&#x20;![21.3 absolute age dating of rocks](http://slideplayer.com/6025992/20/images/11/Absolute+Dating+Determining+how+old+something+is.jpg)<br>

Radioactivity is the tendency of certain atoms to decay into lighter atoms, emitting energy in the process. Compare their protons and neutrons. Beta 1 electron One neutron decays to form a proton and an electron, which is emitted.\
&#x20;![21.3 absolute age dating of rocks](http://2.bp.blogspot.com/-W9jLNU8D02c/TaemhYsgw4I/AAAAAAAAABs/NerbiFfB6NE/s1600/relative+age.jpg)<br>

**Earth Science: Geology, the Environment, and the Universe** - In the process of radiometric dating, several isotopes are used to date rocks and other materials. How does carbon-14 end up in fossils?\
&#x20;![21.3 absolute age dating of rocks](http://slideplayer.com/5799603/19/images/3/Radiometric+Dating+Radiometric+dating+uses+radioactive+decay+of+minerals+in+rocks+and+fossils+to+determine+a+rock+or+fossil%E2%80%99s+absolute+age..jpg)<br>


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