Solution - Soluble minerals (e.g. CaCO3) are dissolved in the river water and transported downstream.
Suspension - Small particulates (e.g. clay & silt) are carried downstream by slow flowing water.
Saltation - Sand and small gravel bounces and skips across the surface of the water on fast flowing rivers.
Traction - Larger gravel, cobbles and boulders roll along the river bed on high energy rivers (usually only occurs during a flood).
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