Bronze age: ( Chalcolithic culture 3000 – 1700 BC)
Chalcolithic : communities using stone implements along with copper and bronze ones.
The Chalcolithic revolution began in Mesopotamia in the fourth millennium B.C. from this area it spread to Egypt, and Indus valley.

The significant features are
1. Invention of plough
2. Agri shifted from hilly area to lower river valley
3. Flood water were stored for irrigation and canals were dug
4. Irrigated farming started in this period.
5. Sowing of seed by dibbling with a pointed stick
6. Salinity problem and water logging were noticed due to canal irrigation.


bronze age