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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.
Filamentus algae. Filamentus algae, commonly known as pond moss or pond scum are a type of pond algae that thrives on the surface of the water and replaces the natural color of the water with green mat-like plants. This plant often grows at the bottom of the pond, and as it ages, rises to the surface.ond algae are a normal part of a healthy environment, but they can grow excessively. These plants are commonly seen floating on the surface of a pond. Unlike most plants, Algae does not have roots or leaves. They often absorb nutrients from elements in the water where they float.