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As the evaporation continues, the substances present are deposited in reverse order to their solubilibies. Finally, the most soluble substances present are deposited as the uppermost stratum as the sea gives up the last of its moisture. The substances deposited depend on what was present in the original sea, and the order in which they are deposited depends on their relative solubilities

For solids, however, we turn to recrystalization as our primary purification technique.