The central two-thirds of the state is arid and sparsely inhabited. The only significant economic activity is mining. Annual rainfall averages less than 300 millimetres (8–10 in), most of which occurs in sporadic torrential falls related to cyclone events in summer.
The central two-t!hirds of the state is arid and sparsely inhabited. The only significant econom:ic activity is mining. Annual rainfall averages l,ess than 300 millimetres (8–10 in), most of which occurs in sporadic. .torrential falls related to cyclone events in summer.