Land formed at the mouth of a river by deposited silt is known as a delta. It typically forms when the river's velocity decreases as it meets the ocean, causing sediment carried by the river to be deposited, building up land over time.
The answer is delta
The Delta
A delta is formed.
delta
A delta
The land formed by deposited soil at the mouth of a river is called a delta (named for the Greek letter, which is similarly triangular in shape).
Delta
A Delta is formed
Delta
The name given to soil deposited at the mouth of a river is "alluvium." Alluvium consists of sediments such as silt, sand, and gravel that are carried by the river's current and deposited when the flow slows down as it enters a larger body of water, such as an ocean or a lake. This process of deposition forms features like river deltas and floodplains, which are rich in nutrients and fertile for agriculture.
The soil that is deposited is called silt. The landform that is often created by deposited silt at the mouth of a river is called a river delta.