Maybe not a rock exactly I just saw a post about the revival of a 32.000 years old plant. The article said scientists found a seed somewhere burried and we’re able to find out it’s age. How is that possible? The same thing for bones and other ancient stuff.
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The method/isotopes used vary depending on what exactly you’re trying to date, but the core concept is generally the same. Radioactive elements/isotopes decay at a certain rate into other elements. Based on how much of the initial radioactive isotope (parent) there is compared to how much of the new one (daughter) there is, you can get a pretty solid idea of how old something is. There are certain assumptions and corrections that need to be made depending on which method is used, where it’s found, etc but that’s the gist of it.
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