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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.
Pond scum is algae (mostly), the green slime on rocks in a stream is also algae, as is the pea soup green seen in some nutrient-enriched lakes. Algae grow when they have the right conditions such as adequate nutrients (mostly phosphorus but nitrogen is important too), light levels, pH, temperature, etc.