Water is a pretty amazing chemical. It exists in all three states of matter naturally on earth. In its solid (ice) form, what principal forces hold it together?

When its molecules lose energy, water becomes solid, it becomes ice. At falling temperatures, the density of water is altered. Water is formed by atoms and molecules. Falling temperatures lead to changes in that compound, in its volume. While density increases because of lower temperatures, water's atoms and molecules get more tightly packed together. Water freezes from the top down.