silt, but what it is made of does vary by region.
Some metals include: Cd, Zn, Ni, Cu, Cr and Pb
Soil is a kind of sediment; if soil were moved by rivers there would be a fairly rapid sorting and changing of the materials in the soil. Much of the organic material in the soil would dissolve and/or be oxidized; particles like sand, silt, and clay would be moved varying distances by the water flow, and their composition would depend entirely on the nature of that material in the original soil. The same is true of coarser pebbles and such that might be in the soil. So, the kind of soil that becomes river sediment depends on whatever soil was there in the first place.
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