an alluvial fan
The soil deposited at the mouth of a river is called silt.
A Delta is formed
Delta
Delta
The river runs however long, all the while picking up sediment, sand, rocks, etc. and continue doing this for the river's length, and at the very end of the river (mouth), all of this sediment is deposited, leaivng sand at the river mouth.
That is called a river '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 by a river to form landforms such as river bars and river deltas is called silt. A river delta is the name of the landform that is created the mouth of a river.
The earth and sand deposited there are called "sediments" and they build up to form what is called a "delta"; a triangular wedge shaped like the Ancient Greek letter "D" - hence "delta".
A delta forms at the point where a river meets the ocean. As river water flows into the ocean, the water slows and sand and silt particles are deposited. This forms the fan-shaped landmass under the water known as a delta.
This land is called a delta and it is formed by the deposition of sediment carried by the river. The sediment, which includes silt and sand, is deposited when the river water slows down as it enters a larger body of water, causing the sediment to settle out and build up over time. Deltas are typically fertile areas due to the rich soil deposited by the river.
sand bars