Why does ice float on water?

B. Water reaches its maximum density at 4°C (40°F). As it cools further and freezes into ice, it actually becomes less dense. On the other hand, most substances are most dense in their solid (frozen) state than in their liquid state. Water is different because of hydrogen bonding.

b- ice has lower density (0.9) than water (1) water is one of the few examples in nature which the solid form float on it's liquid form.

B. When Water freezes the structure changes. The bonding angles of H2O change from a 105 degree angle to a 109 degree angle causing 24 molecules of frozen water to occupy the same space as 27 liquid water molecules. If Ice sank, Water on earth freeze from the bottom up and slowly overtime, the oceans would become solid ice.

B. Dr. Hertzer is close; empty space inside makes the ice float. If you'd like to try an experiment at home, pour some water into an empty yogurt container or something and mark where the water level is. Put it in a freezer overnight so it freezes solid, then note how far the (frozen) water level has risen.

b. 9% less dense. A crystal lattice is formed as water temperature gets colder, as hydrogen bonds are broken pushing molecules apart.

oh wow. never before have i even thought about that fact that they float.

e. ice has less Oxygen than water

none of those. Air inside makes it float.