The factors that helped the growth of civilizations are as follows: 

1. Deposition of fertile alluvial soil caused by the river floods. 

2. Continuous and un – interrupted supply of water for irrigation and domestic purposes. 

3. Favourable climate generally found on the river valleys. 

4. Plenty of food, fruits and vegetables for the humans and fodder for their animals. 

5. River valleys helped fishing. 

6. They helped the growth of trade and communication by providing means of transport.

Above factors reduced the burden of man in wandering for food and risk of life. There is a strong argument that “Men become more civilized if they have leisure to do creative work”. It is certain that river valleys provided them food in plenty and sufficient leisure to develop civilizations. Humans invented metals, made tools, were able to cultivate the land, built buildings in wood and stone, prepared vessels, boats, weapons, furniture, clothing, jewellery and many other things.