Remove ice tray from freezer and place 1-4 ice cubes in drink. Stare in awe as the ice cubes float. Another interesting property of water explains how and why bodies of water freeze the way they do. When the water on the surface cools to this point, it sinks and warmer water from below rises. This explains why oceans freeze from top to bottom and not the other way around.
Ice plays an important part in ground erosion, usually during the winter.
As water seeps into crevices in the ground and freezes, it expands and creates massive force which cracks and erodes the earth. In theory, ice has had a major effect on evolution and the development of the human species. For more information see The effect of the density of ice on evolution by Sharon Fenton of Sheffield Hallam University.