Since the density of liquid substances increases when frozen, these substances sink to the bottom of the container when they are thrown into their own liquids. However, water, which is the source of life, floats when frozen, this is a very important exception. The fact that the glaciers at the poles float on the water is very important, especially for the creatures living under water to survive. We also froze different liquids with our 6th grade students and observed how they stood by throwing them into a bowl with their own liquids. We had so much fun.