What process makes deltas?

Deltas are formed through the process of deposition, where sediment carried by a river or stream is dropped as the water slows down upon reaching a larger body of water, such as an ocean or lake. As the river's velocity decreases, it loses its capacity to transport sediment, leading to the accumulation of materials at the river's mouth. Over time, these deposits build up and create a delta, characterized by its triangular or fan-shaped landform. The interplay between sediment supply, water flow, and tidal influences also shapes the delta's structure and ecology.