Irrigation had mostly contributed to the development of the civilizations that is depicted in the map.
Irrigation
- Irrigation system is used to irrigate the fields and crops by providing the field with water supply.
- Ancient people makes use of canals and drains to irrigate their paddy fields.
- The earliest civilizations developed around places where there were water sources.
- It is used for supplying water to the soils using artificial means.
Ancient river valley civilizations mostly depends upon agriculture. So irrigation is the most important development for for their survival.
Thus, the innovation of irrigation mostly contributed to the development of the river valley civilizations.
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