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The Metal Age started when people learned to make objects out of metal.

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They started to use copper, then bronze, and finally iron.

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People used metals because they are stronger than stone, and they made weapons, ornaments, and tools.

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Metals were found in nature, but not everywhere, so people built towns in places where metals were found.

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They also built walls to protect the towns.

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People that protected the towns were soldiers, under the instructions of a chief.

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There were also people that bought and sold objects, and they were traders.

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In this period of time, there were also three important inventions.

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The wheel, that made it easier to transport goods and people, and was also used to make

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pottery.

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The sail, used to travel by water easily.

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And the plough, which pulled by animals, was used to farm faster.