The preliminary Reference Earth Model: a 1d model of the Earth's elasticity, density, pressure etc: https://en.wikipedia.org/wiki/Preliminary_reference_Earth_model …
Developed in 1981, with some modifications it's still very important today, eg this paper in Nature last week: http://www.nature.com/nature/journal/v543/n7646/full/nature21390.html …
7:32 PM - 25 Mar 2017
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