Final answer:
The primary origin of most neritic sediments is the continental shelf. Sediments from rivers, wind currents, and erosion of the continents are deposited in the neritic zone, resulting in the formation of silt and other types of sediments.
Step-by-step explanation:
The primary origin of most neritic sediments is the continental shelf. The neritic zone extends from the intertidal zone to depths of about 200 m at the edge of the continental shelf. Sediments from rivers, wind currents, and erosion of the continents are deposited in this region, resulting in the formation of silt and other types of sediments. These sediments are well-oxygenated, stable in temperature, and low in pressure, making it an ideal habitat for various marine organisms.