C. Solids.
Because for what i know, particles of a solid are hard to separate as there are strong intermolecular forces holding them together
Answer:
Suface currents are mostly caused by the wind because it creates friction as it moves over the water. This friction then forces the water to move in a spiral pattern, creating gyres. In the northern hemisphere, gyres move clockwise; while in the southern hemisphere, they spin counterclockwise.
It is water pollution, since you are polluting the river.
Hope I helped!
