Put the pan or bowl out into the sunlight. Check out your results with a magnifying glass. What happens The Epsom salt that remains in the pan after the evaporation of the water forms crystal towers. Epsom salts are tiny little crystals that dissolve into water. When you put the pan or bowl of Epsom salt and water solution into the sunlight, the water evaporates because of the heat causing crystal tower-like structures of Epsom salts.
Extensions Try the similar science experiment called Stalactites and Stalagmites.
Wear goggles at all times. Always wear gloves. This experiment is to be done in-class with teacher supervision at all times. In each jar, stir in several tablespoons of Epsom salts. Keep adding the Epsom salts until the solution becomes pretty thick.