An iceberg is simply a massive piece of ice floating on the surface of the water in the oceans. It is made up of frozen fresh water. Icebergs break off from snow-formed glacier or polar ice and drift into the oceans. They constitute danger to ships. Remember, ‘Titanic’ sank when it struck an iceberg.
The part of an iceberg that is above the ocean is less than 10% of the entire iceberg. That is reason why that part is referred to as ‘The tip of an iceberg’. Over 90% of an iceberg lies below the surface of the ocean.
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