Answer :

Steps for the separation of salt, sand, oil and water

First we will use decantation method to separate oil and water. Water being heavier, forms the lower layer and oil being lighter forms the upper layer in the beaker. We can decant off the upper layer of oil into another beaker carefully.

Then by the process of filtration sand can be separated from water. The filtrate obtained contains the mixture of salt and water. The salt dissolved in water can be separated by the process of evaporation. The water present in the salt solution and then the salt is left behind.

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