| http://www.w3.org/ns/prov#value | - Any pyramid has any of these geological characteristics in the surrounding terrain: hills of tezontle stone and sand, mines of silver, gold, copper and other metals, or large limestone deposits acting as photocells, or else lagoons of water charged with electrolytic materials (Tequesquitengo, Alchichica, Texcoco) or the sea itself.??? (p.327).
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