Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.
When an organism dies and is buried, the carbon-14 will decay at a constant rate.
Thus scientists can estimate how long it has been since the organism died based on the proportion of carbon-14 that remains.
Other relative methods include chemical dating, biostratigraphic or faunal dating, and cultural dating.
Chemical dating, such as fluorine dating, compares the relative amounts of absorbed fluorine in bones from the same site.
In 1905, shortly after the discovery of radioactivity, the American chemist Bertram Boltwood suggested that lead is one of the disintegration products of uranium, in which case the older a uranium-bearing mineral the greater should be its proportional part of lead.
Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase...Response: The two major types of dating include relative methods and absolute methods.Relative methods focus on comparison of fossils, strata, or other artifacts to determine which is older and which is younger.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.Molten rock and volcanic ash emerge at such high temperatures that all the argon gas in driven out.