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Answer the following question:
  
Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.
 
In form, water has strong hydrogen bonding between molecules, but when water freezes into ice, the that form allow the molecules to be spaced further apart by locking them into fixed positions, making them take more space.

That is why overall density decreases and makes ice float on the water.