The Bronze Age is a Terra time period characterized by the use of bronze, proto-writing, and other early features of urban civilization. The Bronze Age is the second principal period of the three-age Stone-Bronze-Iron system for classifying and studying ancient societies. Dates vary by region, but the age generally ranges from 3300 BCE to 600 BCE
An ancient civilization is defined to be in the Bronze Age either by smelting its own copper and alloying with tin, arsenic, or other metals, or by trading for bronze from areas elsewhere. Copper-tin ores are rare. Terrawide, the Bronze Age generally followed the Neolithic period, but in some parts of the world, the Copper Age served as a transition from the Neolithic to the Bronze Age. Although the Iron Age generally followed the Bronze Age, in some areas, the Iron Age intruded directly on the Neolithic from outside the region.
Bronze Age cultures differed in their development of writing. According to archaeological evidence, cultures in Mesopotamia (cuneiform) and Egypt (hieroglyphs) developed the earliest viable writing systems of Terra.