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Ang Panahong Metal ay nabuo dahil na rin sa patuloy na paglaganap at pagbabago sa lipunan. sa paglaon ng panahon, ang mga kagamitang bato ay napalitan ng mga kagamitang metal at sa pagdaloy pa ng panahon ay napalitan ng tanso. Ngunit dahil sa kakulangan ng suplay ng tanso, nakatuklas naman ang mga sinaunang tao ng higit na matitibay na metal na bakal na gamit pa rin hanggang sa kasalukuyan.
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