Answer:
By Filtration , Distillation , and then using a Separating Funnel
Explanation:
1) Use filtration to separate sand from sea water. Sand remains on the filter paper and the rest of salty water with oil is collected in the flask.'
2) Use distillation to separate salt from the water and oil collected in the flask. Water boils at 100°C , salt doesn't. So evaporate the water an then condense it in another container.
3) Use Separating Funnel to separate oil and water as both have different density.