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Why ice is lighter than water? Hydrogen bonding gives ice a rather open structure with wide holes. Thus for same volume of water and ice , ice has less mass so it is lighter than water.
The spheres show how finite water and air supplies are. The water sphere measures 1390 kilometres across and has a volume of 1.4 billion cubic kilometres. This includes all the water in the oceans, seas, ice caps, lakes and rivers as well as ground water, and that in the atmosphere. The air sphere measures 1999 kilometres across and weighs 5140 trillion tonnes. As the atmosphere extends from Earth it becomes less dense.