Sedimentation from rivers is called fluvial sediment. Sediment itself refers to matter that settles at the bottom of a body of water or a liquid environment. This could be pieces of eroding rock, sand, clay, pebbles, etc.
This sediment also includes dead bacteria, scales from fish, and other organic compounds that naturally settle.
Sand technically is a specific grain size of clasic (broken) material, from a fraction of a millimeter up to two mm in size. Smaller particles are silt, clay, or mud, and larger ones are pebbles, cobbles, and boulders – with variations in terminology depending on which system you use. River sediment could include all of these, which are size terms and do not relate to the composition.
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