Abstract

1. Proceeding Irom the content of U, Th and K in different igneous rocks, the rate of heat flow of the Earth, the age of the Earth, the initial temperature at the core boundary (just after formation of the Earth), and the melting points for the lower mantle and the core, we may connect the content of radioactive elements in the crust and in the mantle and the core with the depth of the differentiation creating the crust.

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