How is a deltas formed?

Answer 1

1. Deltas form from erosion of rocks.The river must carry enough sediment to layer into deltas over time. The river's velocity decreases rapidly, causing it to deposit the majority.An alluvium builds up to form the river delta.
2. A river delta is a landform that forms at the mouth of a river, where the river flows into an ocean, sea, estuary, lake, or reservoir. Deltas form from deposition of sediment carried by a river as the flow leaves its mouth.Deltas mostly form over long periods of time.