The document discusses the secondary sector in Spain and the Basque Country. It describes how 30% of Spain's population works in industries that transform raw materials into manufactured goods, including primary industries that process raw materials, machinery industries, and consumer goods industries. Spain relies heavily on renewable energy sources like wind, hydroelectric, and solar power, providing 37.4% of its electricity through renewables. The Basque Country's industry originated along the Nervion River centered around iron mining and has a privileged tax system compared to other regions in Spain.