Copper age (20 fev 2300 ano – 21 jun 3500 ano)
Descrição:
in the Bronze Age, people added tin to copper to make bronze, an alloy which is much harder than either tin or copper. During the Copper Age, this fact became known, but was not much used because tin was scarce.[1]Adicionado na linha do tempo:
Data:
20 fev 2300 ano
21 jun 3500 ano
~ 1201 years
