Answer:
erosion and I will copy and paste why if you need that too
In earth science, erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location (not to be confused with weathering which involves no movement). Hope you get it right good luck!
I think all of the above...
because I know they built aqueducts and sewers, so since 2 of they are correct, then all 3 must be.