differentiation
  • noun the developmental process from unspecified cells into complex tissues, organs or body parts
  • The process whereby materials of lower melting and boiling points migrate to the outside of a planet, as in the case of the Earth which has seas and an atmosphere on the outside and metal at its core. On the Earth differentiation has been driven by mechanisms including plate tectonic action and vulcanism. Other planets also seem to be differentiated, possibly to a lesser degree, which suggests that they too have had a geologically active past.

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