Theory:

Time line of anicient civilisation:
time line of ancient civilisation.jpg
Definition:
Civilizations are associated with socio-politico-economic characteristics, including centralization, the domestication of humans and other organisms, specialization of labour, monumental architecture, tax systems, farming as an agricultural practice.
 
Sumerian civilisation is the oldest known civilisation to humankind. Today, the term Sumer is used as southern Mesopotamia, and this civilisation existed in \(3000 BCE\), which was a flourishing urban civilisation. The Sumerian civilisation was predominantly agricultural and had community life.
 
oldest civilisation.jpg
These ancient civilisations Mesopotamia, Egypt, and Indus Valley civilisation, Andes, China, and Mesoamerica, are supposed to have emerged approximately \(6,000\)-\(3,500 \)years ago.
The Bronze age was a period when the most advanced metal working was included. It was used systematically. Copper/tin ores were rare, and there were no tin, bronzes in western Asia before \(3000 BCE\). In some parts of the world, the Copper age follows the Neolithic period and precedes the Bronze Age.

In Iron age many advanced tool making techniques were emerged with and iron as a prominent ingredient. The usage of iron easily coincided with changes seen in agricultural practices, religious beliefs and artistic styles of past society.