Daly's earth model has a solid crystalline crust varying in thickness but not exceeding fifty miles. This crust encloses a continuous layer of vitreous rock, relatively thin, which rests on a denser vitreous material. The heavier substratum surrounds a so-called “iron core” possibly crystallized by high pressures of the interior. This vitreous subcrust has some properties of a solid; hence, it behaves more or less like a rigid mass.

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