METALS

METALS

1. Are substances from minerals which contain one or more metallic elements, and sometimes non-metallic substances such as carbon.

   • Metallurgy is the group of industries involved in mining and transforming metallic minerals.
     • Ferrous metals
       • pure iron
         • steel
           • cast iron
     • Non-ferrous metals
       • copper
         • bronze
           • aluminium
             • zinc
     • Some of them, such as lead or mercury, are toxic for the environment.

2. surface mines

   • electrical, thermal and acoustic conductors.
     • ductile and malleable.
       • They expand when the temperature rises and contract when it cools.
         • magnetic and are attracted to magnets.

3. underground mines

   • They are tough.
     • hey melt at high temperatures so they can also be used for welding.
       • rust
         • recycled and reused.