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Answered 2015-09-30 14:21:26

For each part of the iceberg you see above the surface, there's a much bigger part below the surface, providing buoyancy for the part that is lifted into the air. Just as with ice cubes, most will float below the surface and a little will float above.

The size - well, that's determined first by how they break off from glaciers and shelf ice. Later by erosion and melting.

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