An iceberg is not sea ice or pack ice, which is the byproduct of the freezing of ocean water. Instead, it is a glacier’s fragment, which falls down into the ocean and drifts away. The science behind your question is this: Freshwater has a higher freezing temperature than saltwater, and saltwater also has a higher density. Ice is special because it is actually less dense as a solid, thus it floats atop the denser saltwater. Take a look here for a way to calculate how much ice is under the water based on features from the visible part of the iceberg. (http://science.howstuffworks.com/environmental/earth/geophysics/iceberg1.htm)
Let me know if this wasn’t what you were looking for, thanks!
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