Large masses of ice that break off from glaciers and float in the ocean, with most of their volume hidden underwater.
From Dutch 'ijsberg' (ice mountain), combining 'ijs' (ice) and 'berg' (mountain). The term became widely used in English after the 18th century as arctic exploration increased.
The Titanic disaster made icebergs famous, but what's wild is that only about 10-15% of an iceberg is visible above water due to physics—ice is less dense than seawater, so it floats with most of its bulk submerged.
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