Ice
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Ice is frozen water. At one atmosphere of pressure, water turns into ice at 32 degrees Fahrenheit (0 degrees Centigrade).
Due to the nature of its crystalline structure, ice is around 10% lighter than liquid water, which is why ice cubes float in your drink and icebergs float in sea water.
70% of the world's fresh water is ice, almost all of it located at the polar ice caps in Antarctica and the Arctic. However, this only constitutes a small percentage of the Earth's overall water reserves[1].