Another word for small pieces of soil that are carried in erosion

Sediment

Explanation:

Sediment the matter that settles at the bottom of the liquid

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

your answer would b. the missisipi river

hope i you : )