Answer:
In order to form delta weathering, erosion and deposition work together. The weathering breaks down the rocks by wind, water or frost. Erosion help to transport the broken particles and the deposition occurs in order to finally settle the eroded materials to a new location that results in the formation of a delta.
A delta is a fan-shaped area of land that is formed a deposition of sediments at the mouth of the river, where it empties into an ocean.