धातुजननिक युग।

धातुजननिक युग (Metallic Era) वह समय है जब पृथ्वी पर धातु खनिजों का प्रमुख उपयोग शुरू हुआ। इस युग में मनुष्यों ने धातु, जैसे कि तांबा, _________ _________ ___ ______ _________ _____ ____ ____ _______.
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