The geological process that contributed to the creation of the Coastal Plains is Sediment deposition from rivers.

The Coastal Plains were primarily formed through sediment deposition from rivers over millions of years. As rivers flowed toward the ocean, they carried sediment, such as sand, silt, and clay, which settled along the coast. This gradual buildup of sediment created the flat, low-lying landscape that defines the Coastal Plains today. The process enriched the soil, making it fertile and ideal for agriculture. Additionally, this deposition contributed to the formation of wetlands, deltas, and estuaries, which support diverse ecosystems. The geological history of sediment deposition plays a crucial role in shaping the region’s topography and its environmental significance.