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Geologists often need to know the age of material that they find.
These break down over time in a process scientists call radioactive decay.
Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.
This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.
We will deal with carbon dating first and then with the other dating methods.
Carbon has unique properties that are essential for life on Earth.