The Three Age System: Stone, Bronze, and Iron
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The Stone Age - A Brief History
The first metal that humans began to regularly work with was actually copper. Copper is very soft, and it isn't necessarily better as a cutting tool than a flint nap knife. The oldest simple copper object made by humans dates back to about nine thousand b c. If you mix approximately 12 % tin with 88 % copper, you get the alloy known as bronze. Bronze has many advantages over copper. It's much harder. It doesn't corrode, it doesn't make sparks. And you can use bronze in casts to make complex objects. You can make an honest to good axe head out of bronze, which would be difficult to do with copper. Swords meant armies and the creation of larger
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