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The stone age was the use of stone and fire in 4000 B.C.
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The bronze age was the use of bronze in 3300-1200 B.C.
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The iron age was the use of iron in 1200-1000 B.C.
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The agricultural age was the use of crops and animals as a food source in 10 000-8 000 B.C.
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The industrial age is the change in economic and social organizations with machines that run with power instead with hand used machines in 1760-1840.
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The informational age was the use of information technology from the industrial technology in 20th century.
