Why did many of the early civilizations develop around river valleys?

Answer 1

Civilizations around rivers have the resources they need to expand and innovate; food (crops, animals around and in river); plenty of water; and this bounty of resources gives the people the free time in which to innovate (this creates civilizations)

Answer 2

Civilisation rests on surplus, where the initial scramble to make a living by hunting and gathering, then primitive agriculture, and the accociated predatory tribes who batten on it, are replaced by productivity which provides a living plus a surplus which allows a degree of effort and resources to be diverted to cultural and leisure activity.

Such surpluses can best be gained through very productive farming and both domestication of animals and use of Metallurgy to produce tools, and leading to trade to supply locally-deficient materials and foodstuffs.

The river valleys, their soils refertilised through annual floods, and reliable water for irrigation, both provided the growing environment and the means of transport to facilitate the development of sustainable surpluses. And with it came the capability to organise and defend rising prosperous communities.
so people could gro crops

Answer 3

because when the river drops eroded sediment it makes flood plain soil fertile and the more fertile the land the eaiser it is to grow crops.

Answer 4

Along rivers, those civilizations can farm better because of rich fertile soil, good sources of water to use for daily needs.

Answer 5

It was a close resource for water and it supplied water to people's farmland and it had fertile soil.

Answer 6

That's where the fertile land is and rivers are used for transport.