Erosion , to be rubbed away gradually, transport , the water carries the rocks, mud and sand (known as sediment) along., deposit, to put something down and leave it, source , the start of the river, mouth, the end of a river when it reaches the sea or a lake., tributaries , where the river splits into streams, confluence, where two streams join, meander , when the ground becomes flatter, the river slows down and swings from side to side, oxbow lake , when a meandering bend gets cut off from the river..

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