The Stone Age, the Bronze Age, and the Iron Age are three period of history identified by the way people made tools and weapons. Different ancient civilizations developed at different speeds. So you might have one group of early people using bronze tools, while another group was still using stone tools. read more
The three-age system has been used in many areas, referring to the prehistorical and historical periods identified by tool manufacture and use, of Stone Age, Bronze Age and Iron Age. Since these ages are distinguished by the development of technology, it is natural that the dates to which these refer vary in different parts of the world. read more