<P> A stone drill </P> <P> The Copper Age is the early part of the Bronze Age . Bronze is made when tin is added to copper and brass is copper with zinc . Copper came into use before 5,000 BC and bronze around 3,100 BC, although the times vary by region . Copper and bronze were used for the same types of tools as stone such as axes and chisels, but the new, less brittle, more durable material cut better . Bronze was cast into desired shapes and if damaged could be recast . A new tool developed in the copper age is the saw . Other uses of copper and bronze were to "harden" the cutting edge of tools such as the Egyptians using copper and bronze points for working soft stone including quarrying blocks and making rock - cut architecture . </P> <P> During the Bronze Age the corbelled arch came into use such as for beehive tombs . The wheel came into use but was not common until much later . Heavy loads were moved on boats, sledges (a primitive sled) or on rollers . The Egyptians began building stone temples with the post and lintel construction method and the Greeks and Romans followed this style . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (April 2014) </Td> </Tr> </Table>

What is one of the greatest structural achievements of the bronze age