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Delta.
The answer is DELTA
erosion
It is called a delta
As a river flows it picks up sediment and carries it away. When the river reaches the ocean the sediments deposited, over time a delta forms.
1. The quantity of water in the river. 2. The size of the river basin. 3. The course of the river 4. The shape of the river reliefs.
The Amazon River, by far the greatest giver of river sediments.
A river carries sediment due to its high flow velocity. When a river reaches the ocean, this flow velocity is decreased and therefore not strong enough to carry the sediments farther. Thus, sediments are deposited or dumped when a river reaches an ocean or lake where the flow velocity is generally less than that of rivers.
sediments
sediments are transported by ocean rift, streams, river currents, wind (air). they are deposited according to size. The largest sediments are deposited first. The sediments settle into the sand and are carried by the stream. Near the mouth of the stream where the water moves slowly the small sediments settle out. The larger sediments get carried by the river into the sea then the samller sediments. The sea water dissolved minerals and soak the sediments and cement together. This eventually forms sediments.
Sediments found in a sandbar of a river
They don't. Sediments can make a river more shallow.