Respuesta :
Potassium-Argon dating has the advantage that the argon is an inert gas that does not react chemically and would not be expected to be included in the solidification of a rock, so any found inside a rock is very likely the result of radioactive decay of potassium. Since the argon will escape if the rock is melted, the dates obtained are to the last molten time for the rock. Since potassium is a constituent of many common minerals and occurs with a tiny fraction of radioactive potassium-40, it finds wide application in the dating of mineral deposits. The feldspars are the most abundant minerals on the Earth, and potassium is a constituent of orthoclase, one common form of feldspar.
Answer: Inert substance
Explanation:
Potassium and argon makes it useful for potassium-argon dating, which is a method that is used to determine the time of origin of a rock.
This is done by measuring the ration of radioactive argon to ratio of radioactive potassium in the rock.
As argon is an inert element so it does not disappear from the rock and remains in it.
