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Sediment is dirt or other matter that settles to the bottom in a liquid. All the little dirt particles that sink to the bottom of a pond are an example of sediment. 1  matter that settles to the bottom of a liquid. 2  Geol. 3  matter deposited by water or wind.
A riffle is an area of fast moving, churning water. A run is an area of smoothly moving water. A pool is an area of stagnant water. Each habitat type supports different types of aquatic life, so a stream with a greater diversity of habitat types will generally support a greater diversity of organisms.