snow is insoluble in land & if something is insoluble in something , then they will remain separated ->  sand will remain as solid particles in water  sugar is soluble in land & if something is soluble in something , then that something can be dissolved in something forming a problem ->  salt will dissolve in water  sand will remain as solid particles in water & salt will dissolve in water ->  adding water to salt and sand will produce a mixture of liquid and solid particles  adding water to salt and sand will produce a mixture of liquid and solid particles & a ideal is used for separating steam from mist diamonds -> a filter can separate sand from salt water