Conversation so far:
how did the location of bodies of water affect settlement in china
The soil around the Yangtze and Huang He Rivers was rich and good for farming due to the silt that was deposited during the spring floods.
and in egypt how did the location of bodies of water effect settlement
The most important result of this expansion of the Sahara for human civilization was that it pushed humans closer to the Nile River in search of reliable water sources.

Question: when did they develop agriculture
Self-contained rewrite: when did early human civilizations develop agriculture