2) Further, the very physics-based reasoning concerns the fact that the ancient inhabitants of different settlements worked with metals - Iron Age, bronze, brass, lead, steel (Fe, Cu, Sn, Pb).
2) Zaidi ya hayo, hoja sana fizikia makao wasiwasi FACT Hiyo Wakazi wa kale wa Makazi kazi na vyuma tofauti - Umri Chuma, shaba, shaba, risasi, chuma (Fe, Cu, Sn, Pb).