1 янв 1775 г. до нашей эры - Iron

Описание:

- extracted by calcination and then smelting iron ore
- calcination is when the iron ore is heated in the absence of air (oxygen)

-Discovered in the Bronze Age. The Bronze Age is a historical period characterized by the use of bronze. Bronze is a mixture of mainly copper and tin. Bronze is malleable meaning it is easy to mould into tools and weaponry.

-Iron is used to manufacture steel, used in engineering ( for example reinforced concrete) and in manufacturing.

Iron has to be blasted and chemically extracted to be pure.