Use of metal.
- Christian Thomsen studied the pre-historic artifacts and antique objects and introduced the 'Three Age System' for classifying these objects.
- The objects were classified into the following order :
(i) Stone tools
(ii) Copper tools and articles
(iii) Iron tools and articles.
- Gold was the first metal used. It was a soft metal and could not be used to make tools and implements.
- Humans discovered copper to make tools and thereby the 'Copper Age' began.
Concept: Types of Element: Metals
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