The area of land drained by a single river or stream is called a(n):

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

compost can be added to topsoil as a:

pesticide

explanation:

okay now i don't know this but for the pints nothing else to say bye

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes