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sediment
It is first deposited by rivers. Then it is carried by waves form the ocean floor to the beach.
Some of it is carried up the shore and deposited higher up the beach. Some is deposited on the seabed.
a rock
sand deposited by waves.
The soil deposited at the mouth of a river is called silt.
Moraine.
Moraine.
That is called a river 'delta'.
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".
Delta
A Delta is formed
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.
an alluvial fan
Where a coastline turns and interrupts longshore drift, sand may be deposited in a fingerlike landform called a spit.
A sand dune.