What enables ice to float?
Because, unusually, the density of the solid phase is LESS than the density of the liquid phase.
An ice cube in a glass of water floats. An iceberg when it forms (when it
The structure of solid ice is ordered by hydrogen bonding between molecules; it happens that the arrangement of solid water molecules occupy 10% more volume than the liquid volume. Hence ice floats. Given that sea water contains a lot of salts, the buoyancy of a fresh water berg should also be greater.