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Thus, the ratio of argon-40 and potassium-40 and radiogenic calcium-40 to potassium-40 in a mineral or rock is a measure of the age of the sample.
The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium.
Acetone is sometimes used while extracting fossils, because it dissolves dirt.
In short, unless you have evidence to the contrary, you should assume that most of the carbon in a fossil is from contamination, and is not originally part of the fossil. The nuclear tests of the 1950's created a lot of C14.
QUESTION: Can we use radioactive carbon dating to determine the age of the earth? Other radiometric dating methods such as potassium-argon or rubidium-strontium are used for such purposes by those who believe that the earth is billions of years old.
If you hear of a carbon dating up in the millions of years, you're hearing a confused report. Second, they rarely contain any of the original carbon.
The bond between carbon and chlorine is more polar than the bond between carbon and sulfur.
To compare bond polarities, compare the difference in the electronegativities between the atoms.
Pollen found in the Greenland icecap has been carbon dated, and also dated by counting ice layers. Trees grow a thick ring in a good year, and grow a thin ring in a bad year.
It is sometimes possible to match up tree-ring patterns between different trees.
Both of these man-made changes are a nuisance to carbon dating.