LINEA DEL TEMPS DELS METALLS By LLUIS PLA 10,000 BCE PEDRA 6000 BCE ORO 4200 BCE COURE 4000 BCE PLATA 1750 BCE ESTAÑO 1500 BCE FERRO 750 BCE MERCURI 1751 NIQUEL 1789 URANI 1791 TITANI 1797 CROM 1823 SILICONA 1827 ALUMINIO
