Answer:
Homes in villages were buried partly underground with straw-covered roofs. Walls were built to protect settlements from flooding and hostile neighbors.
Causation I think if I have the right meaning
Answer: 1,039/Smoothed Out Slappy Hours
Explanation: Brainliest? Have a good day! :D
Lots of trade was done through the silk road. this route went through east Asia and Western Europe
http://historyworld.net/wrldhis/PlainTextHistoriesResponsive.asp?ParagraphID=gpy#c1920