Definition: Sediment is an environmental substance comprised of any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bedor bottom of a body of water or other liquid.
Definition: An estuary which is located in regions where evaporation greatly exceeds the inflow of fresh water, forming a zone of maximum salinity towards which both riverine and marine water masses flow, before sinking and spreading along the bottom in both seaward and landward directions.
Definition: Expressions of the estuarine biome occur at wide lower courses of a rivers where they flow into a sea. Estuaries experience tidal flows and their water is a changing mixture of fresh and salt.