Crystals like those in Cueva de los Cristales form when hot, mineral-rich water fills underground cavities and remains undisturbed for a very long time. In the case of this cave, the water was ...

the water evaporating, and the salt crystals re-forming. Dissolving a solid in a liquid depends on the interactions and attractions between the molecules of the liquid (solvent) and the particles of ...

Add 2 teaspoons of room temperature water to each cup. At the same time, you and your adult partner should swirl the cups for about 30 seconds. Did you notice any differences in the amount of each ...

Doing so pushed the urea, oxygen from the surrounding air, and hydrogen in the water to form solid percarbamide crystals. The crystals were then filtered from the water, ready for use as a fertilizer.

But it's not just the Bahamas or the Dominican Republic that have crystal-clear oceans, and calm waters aren't the only factor at work here. Certain bodies of water, like those off the coasts of ...