Water is "unique in that it is the only natural substance that is found in all three states -- solid, liquid and gas".
What is solid?
Solid is "a state of matter which has a fixed shape, mass, and volume.
Hence, water changes its composition when its frozen".
What is liquid?
Liquid "is a form of matter in which molecules move around freely but still experience attractive forces".
What is gas?
Gas is "a state of matter that has no fixed shape and no fixed volume".
Hence, the composition of water changes when it is frozen.
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