Liqiud water is dense than ice.
The solid form of water is less dense than the liquid water. It is characteristic feature of water. This caracter helps the aquatic animals, otherwise they would be crashed. The light ice float at the surface of water. Thank you
Water is more dense due to geometry and polarity
As you can see, despite being less stable than ice, water is more closely packed. This is because ice has a bent shape. It is quite odd, really.