A thermoplastic is a type of plastic made from polymer resins that becomes a homogenized liquid when heated and hard when cooled.
As similar as colonial iron manufacture was to that of medieval Europe, yet it differed greatly from the type of iron manufacture in eighteenth century early modern Europe. Existing conditions of natural resources greatly affected the development of technical innovation in the field of iron manufacture.
Iron was discovered early in the 2nd millennium BC, but like copper, did not become the dominant material in tools and weapons for a along time. The first advanced agrarian societies did not appear until the early years of the 1st millennium BC.