solution - substances that can dissolve are carried along in the winter e.g. limestone is dissolved into river water that's slightly acidic
suspension - very fine material, like silt and clay particles, is whipped up by turbulence (erratic swirling of water) and carried along in the water. most eroded material is transported this way
saltation - larger particles, like pebbles or gravel are too havy to be carried in suspension. instead, the force of the water causes them to bounce along the river bed
traction - very large particles e.g. boulders are pushed along the river bed by force of the water
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