A monument named for this resource stood for over 1000 years before being chipped by a cannonball.
Plentiful supplies of this resource at Rajgir helped propel the state of Magadha to power. A monument named for this resource stood for over 1000 years before being chipped by a cannonball. This was the nonedible one of the resources discussed in discourses held by Emperor Wudi. A famous (*) pillar named for this resource was built by the Gupta Empire. Monopolies on salt and this resource ruined the Han dynasty's economy. The Vedic Age is coterminous with an age named for this metal. For 10 points, what metal names an Age succeeding the Bronze?
Plentiful supplies of this resource at Rajgir helped propel the state of Magadha to power.
iron [accept iron ore; accept Iron Pillar; accept Fe or ferrum]