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Tip of the iceberg
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The tip of an iceberg which is visible above the waterline is usually only about 1/7 or 1/8 of the mass of an iceberg.
Move your cursor under the iceberg, to reveal the remainder of the iceberg.
Seawater is slightly denser than ice and this means that the iceberg floats with most of its mass below the surface. In comparison a cork which has a density of about 20% that of water floats close to the water surface. Ice has about 90% of the density of water but the density of seawater is also influenced by the temperature and salinity.
