Question:
What process was primarily responsible for the formation of a delta ?
Answer:
Weathering, transport, and deposition.
Rock and soil erode, are
carried by the water downriver until the motion of the water is too
slow to support the load, which is usually at or near the mouth of the
river.
A delta is formed where a major river enters the sea
which has a small tidal range. If the tidal range is high then the
sediment is washed away and an estuary is formed. The delta is named by
its shape: it looks like the letter D in the Greek alphabet.
Hope this helped :D sorry for long answer