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Crystals form effectively when a solution becomes supersaturated with salt. The extra salt takes the form of crystals when the solution cools down or some water evaporates. Calcium chloride is an effective salt at trapping water, as it can absorb moisture from the air and dissolve into a liquid brine if conditions are humid and warm enough. Since science is an ongoing process, I think new questions should be investigated. First question is under what conditions do these crystals form effectively? For this question, the data we need is that crystals grow when the solution becomes supersaturated, meaning that there is too much salt dissolved in the water. The extra salt takes the form of crystals to get a supersaturated solution that can either cool down the solution or let some of the water evaporate. And the second question is what types of salts are most effective at trapping water? The data we need for this question is calcium chloride that absorbs moisture from the air effectively. It can attract several times its own weight in water, dissolving into a liquid brine of the air if the air is humid enough and the temperature is high enough.