The document summarizes key aspects of the secondary sector, which includes industries that transform raw materials into goods. It describes the main activities in the secondary sector as industry, mining, energy production, and construction. Industry transforms raw materials into manufactured products or semi-finished products using raw materials, energy sources, and production factors. Mining locates, extracts, and refines rocks and minerals. Energy production transforms energy sources into heat and electricity. Construction creates buildings and infrastructure using plans and building materials. The document also discusses raw materials production, consumption, and problems related to scarcity. It notes that offshoring has moved many industries to developing countries with lower labor costs.