This is the moment the series leaves the Bronze Age behind. He explains why iron replaced bronze—iron ore is everywhere while tin trade can collapse—then traces where iron ore deposits came from (the ...
Add Yahoo as a preferred source to see more of our stories on Google. Sparkly hematite mineral was used as a flux by copper smelters. Its distinctive appearance may have helped to attract attention ...
SubtitleMinerals, Ore Deposits, Smelting, Weathering, Petroleum, and the Earth's Elements Used by HumanityIntroduction | ...
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