Internal consistency of radiometric dates[ edit ] In our discussion of radiometric dating , we have seen that many, indeed most, radiometric methods are self-checking. All biological tissues contain amino acids. Many factors can spoil the sample before testing as well, exposing the sample to heat or direct light may cause some of the electrons to dissipate, causing the item to date younger. This: relative dating a ratio of the last two kinds of the age of uranium and 3.
Relative dating is sometimes called relative. All amino acids except glycine the simplest one are optically active , having an asymmetric carbon atom. But it would be bizarre to doubt the general picture they paint.