More brittle than glass, at times stronger than steel, at other times flowing like molasses, ice covers 10 percent of the earth's land and 7 percent of its oceans. Mariana Gosnell here explores the history and uses of ice in all its complexity, grandeur, and significance. From the freezing of Pleasant Lake in New Hampshire to the breakup of a Vermont river at the onset of spring, from the frozen Antarctic landscape that emperor penguins inhabit to the cold, watery route bowhead whales take between Arctic ice floes, Gosnell examines icebergs, icicles, and frostbite; sea ice and permafrost; ice on Mars and in the rings of Saturn; and several new forms of ice developed in labs. A record of the scientific surprises, cultural magnitude, and everyday uses of frozen water, "Ice" is a sparkling illumination of a substance whose ebb and flow over time has helped form the world we live in.