What was one of the primary results of chinese civilizations settling in the river valleys?

Chinese civilizations, just like many other ancient civilizations, settled in river valleys. There are several reasons for this. However, the main reason is the fact that river valleys are extremely fertile areas. The fact that soil around these areas is particularly fertile means that it is able to support a large population. Therefore, this allowed for the expansion of Chinese civilization, and allowed it to develop increasingly complex social arrangements.

the two atomic bombs dropped on japan in 1945 killed and maimed hundreds of thousands of people, and their effects are still being felt today. the uranium bomb detonated over hiroshima on 6 august 1945 had an explosive yield equal to 15,000 tonnes of tnt.