Assertion: source pollution | /r/HasProperty | difficult to control
Facets:
Source sentences:
text: Nonpoint source pollution is difficult to control because it comes from many different sources and locations.
text: Nonpoint source pollution is difficult to control because it comes from multiple locations.
text: Nonpoint source water pollution is difficult to control because it comes from the everyday activities of many different people, such as lawn fertilization, applying pesticides, road construction or building construction.