What were some of the causes of the amu darya and syr darya rivers being ruined? select all that apply.

tourism
tannery dumping
agricultural chemicals
drying up
urban sewer drainage

What two advantages do the coastal countries of west africa have over the sahel countriesfertile soil and mineral resources temperatures and terrain human resources and natural resources weather patterns and location

How does central place theory explain patterns in the size and distribution of cities?

What is the border between layers a through f and layer g called?