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| Description: In its liquid form, the hydrogen bonds between water molecules continually form, break, and re-form, resulting in an ever-changing arrangement of molecules. At temperatures at or below its freezing point, water forms a crystalline matrix called ice. In this solid form, hydrogen bonds are more stable. Ice has a hexagonally shaped crystal structure. The greater space between H2O molecules in this crystal structure causes ice to have a lower density compared with water. For this reason, ice floats on water.
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