radio_free_asgarthr [he/him, comrade/them]

A real geologist should give a real answer, but more or less it is due to how the molten elements and molecules sorted out back when the earth was younger and hotter. It has a lot to do with relative densities, melting points and propensity to mix with other materials. Everything heavier than helium and trace amounts of lithium are "star dust", the geology of earth is how that coalesces together and then combines and separates out in geological processes.

I stumbled upon Russian Cybernetics in some google search related to the academic discipline of cybernetics. I like it as background music because it is mostly a very mellow electronic music. And I don't speak Russian, so most of the lyrics aren't distracting and mentally filtered out. Though some songs have english lyrics.