4 sept 2900 año aC - First evidence of bronze tools
Descripción:
Bronze tools are more advanced. They are used for longer and that helped create helpful tools. They were replaced with earlier stone tools.
Bronze tools are made of copper and tin. It is much stronger than copper. And it stays sharp for a longer time. Bronze helped with the creation of the wheel, the plow, writing , money, cities, armies.
Añadido al timeline:
Neolithic Timeline
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