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### Best Answer Glasso says

Floating objects displace amount of fluid equal mass of floating object. This creates enough buoyancy to keep an object afloat. Since the density of iceberg is about 90% of seawater density, approximately 90% of iceberg will be under water in oredr to displace enough water.

### flysky says

Great explanation Glasso! It is worth mentioning that this fact is described by the Archimedes's principle. In this particular case, buoyant force Fb acting on around 90% of the iceberg balances gravity force Fg on the iceberg. More precisely, from Fb = Fg if follows ρ * g * (V / x) = m * g where is the density of water, g gravitational acceleration, V is the volume and m mass of the iceberg. A short calculation gives result.