Deposition of salt from evaporated water

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papernuke
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When a small volume, say 5ml, of saturated solution of NaCl is left on a flat surface and evaporates, why does the salt always become concentrated on the outer edge of the base where the solution was? Why doesn't it form a uniform distribution of salt throughout the entire area which the solution previously took?
 
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It could be something to do with the temperature distribution over the surface (due to evaporation) or the rate of water movement where the liquid is more shallow - the outside edge being a bit more concentrated..