Copper age (20 feb 2300 año – 21 jun 3500 año)
Descripción:
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]Añadido al timeline:
fecha:
20 feb 2300 año
21 jun 3500 año
~ 1201 years
