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Used for young organic materials, or surface-water samples: Wood, charcoal, peat, bone, tissue, carbonate minerals from surficial environments, water containing dissolved carbon.

There is a clear mathematical relationship between the amount of a radioactive isotope (and the corresponding amount of daughter product), and the number of half-lives that have elapsed.

For example, say a fossil is found that has 35% carbon 14 compared to the living sample. We can use a formula for carbon 14 dating to find the answer.Granites of this sort are associated with uplift and formation of mountain ranges. Formed by metamorphism of rocks that were originally sedimentary.The metamorphism occurred after the rocks were buried to great depth by mountain building.Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.

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