Answer: The river was important for fertile soil and crop development
Explanation: The basic prerequisite for the development of early world's civilizations was the settlement, i.e. the transition from the nomadic lifestyle and the beginning of agriculture. For agriculture to develop, and therefore to increase wealth and power as a prerequisite for strengthening emerging civilizations, fertile soil was needed where people in the settlements could engage in agriculture. The fertile soils are found in the river valleys, as a result of periodic flooding and the application of minerals and nutrients to the surrounding soil, and made it fertile.
