Two theories about the origin of isotopes in the Earth's crust are compared using the methodological approach known as Occam's razor, according to which " Entities must not be multiplied beyond necessity." The first is a well-known theory based on several hypotheses, the probability of which simultaneously being fulfilled is negligibly small. According to the second theory, two identical nuclides of closely spaced nuclides can exchange nucleons in a medium consisting of many different nuclides. Simple modeling of this process shows that the composition of the nuclides ultimately turns out to be the same as the isotopic composition of the Earth's crust. This same modeling explains the origin of the heavy elements in the Earth's crust, the relatively high percentage of uranium in the Earth's crust, and the fact that uranium is younger than the Earth. To confirm the presented results, about a hundred videos are provided, illustrating the results of similar exchanges for all stable nuclides existing on Earth.
Vladimir Torchigin (Thu,) studied this question.