River or lake sediment (4)
I believe the answer is:
silt
(Other definitions for silt that I've seen before include "Muddy deposit" , "Sedimentary material" , "Sedimentary deposit" , "Sediment in a stream" , "Sediment deposited by a river" .)
I believe the answer is:
silt
(Other definitions for silt that I've seen before include "Muddy deposit" , "Sedimentary material" , "Sedimentary deposit" , "Sediment in a stream" , "Sediment deposited by a river" .)