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considerable range in size, from a length of a few metres in a small stream to marine depositions stretching for hundreds of kilometers along a coastline , often called barrier islands . composition[ edit ] they are typically composed of sand , although they could be of any granular matter that the moving
water has access to and is capable of shifting around (for example, soil , silt , gravel , cobble , shingle , or even boulders ). the grain size of the material comprising a bar is related to the size of the waves or the strength of the currents moving the material, but the availability of material...
https://en.wikipedia.org/wiki/Shoal