The Bronze Age began around 2500 BC with the appearance of bronze objects. The Bronze Age saw a shift of emphasis from the communal to the individual, and the rise of increasingly powerful elites whose power came from their prowess as hunters and warriors and their controlling the flow of precious resources to manipulate tin and copper into high-status bronze objects such as swords and axes. Settlement became increasingly permanent and intensive. Towards the end of the Bronze Age, many examples of very fine metalwork began to be deposited in rivers, presumably for ritual reasons and perhaps reflecting a progressive change in emphasis from the sky to the earth, as a rising population put increasing pressure on the land. England largely became bound up with the Atlantic trade system, which created a cultural continuum over a large part of Western Europe. It is possible that the Celtic languages developed or spread to England as part of this system; by the end of the Iron Age there is much evidence that they were spoken across all England and western parts of Britain.