Description Ice is a solid, non-metallic solid state of a substance that may be liquid or gaseous at room temperature, for example hydrothermal ice or ammonia ice. In English, the word ice often means water ice. Ice is formed everywhere if water and cool air meet, and the water simply turns into ice. Mountains, glaciers or frozen land can sometimes form, and lakes often freeze (or, rather, lake roofs, although a thick layer of lake surface sometimes freezes that a lake can not completely freeze). Nearly three-quarters of the world's freshwater is stored in ice, distributed between Antarctica, Greenland, the Arctic, high mountain peaks and elsewhere around the world.