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lead processing — Introduction preparation of the ore for use in various products. Lead (Pb) is one of the oldest metals known, being one of seven metals used in the ancient world (the others are gold, silver, copper, iron, tin, and mercury). Its low… … Universalium
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
FER (MINERAIS DE) — Le fer est l’élément qui a permis l’essor de l’industrie moderne. Alors que l’on a assisté à l’avènement de nouvelles formes d’énergie, on peut dire que, en ce qui concerne les produits, notre civilisation en est encore à l’âge du fer, dont… … Encyclopédie Universelle

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