For this colorful science activity, you'll need to gather the following: cooking oil (such as vegetable oil), cold water (without ice), salt, a clear glass or jar and Liquid Watercolor or food coloring.
Fill the clear glass or jar about three-quarters full of cold water. The water should be cold, but not iced. Then, stir in a few drops of food coloring.
Add cooking oil to the water—enough so that it will add about 1/2 inch. The oil will float on the top of the water.
Wait until the oil and water have completely separated into two distinct layers before continuing to the final step.
Sprinkle salt on top of the oil. Continue adding salt to see what happens. The salt will begin to sink and take blobs of oil with it, creating a lava-type reaction.