Question

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

Answer 1

Fertile land and food supplies would be the answer  
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Answer 2

Answer:

The fertile land supported a surplus.

Explanation:

River Valley important habitual site for most of civilization as it provide a constant source of food supply in the form fishing and coastal areas could provide a good land for agricultural activities. Same is the case of China were the first Chinese civilization occurred around the Yellow River.