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The reason why ice floats on water:
When water is exposed to subzero temperatures; it crystallizes into ice. During this transformation the hydrogen bond between the molecules is severed by formation of a lattice. This process causes the ice to be larger proportionate to its liquid form but less dense. Moreover, the inner hollow space is filled with air,which is also lighter than water in its liquid form. Because of these reasons, ice seems to float on water which has more density than it has.
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