Through river basins, and administrative boundaries to protect their natural water resources.
I would say wind, because wind would cause the storm surges to appear during the hurricane. Debris is what is leftover after the storm, and I don’t think there is usually snow during a hurricane. I hope this helps you out. Good luck!
I believe it was the spread of Christianity although increase trade was amazing. The Chinese did not want the spread of Christianity and was mostly a traditional area.
24= 3x+6
-6 -6
18 = 3x
— —
3 3
6 = x