Final answer:
Estuaries are biomes where fresh water from rivers meets the ocean. The silt and clay carried by the rivers gets trapped in estuaries, creating protected areas for diverse marine life.
Step-by-step explanation:
Estuaries are biomes that occur where a source of fresh water, such as a river, meets the ocean. During this mixing process, silt and clay particles brought in by rivers and streams can trap organic and inorganic matter in the estuaries. The settling of silt and clay in these areas creates protected environments that serve as breeding grounds for various organisms, including crustaceans, mollusks, and fish.