An iceberg is a large chunk of freshwater ice, over 15 meters long, that has broken off a glacier or ice shelf and floats freely in the ocean, with most of its mass (about 90%) hidden underwater; they come in shapes like flat-topped tabular or irregular non-tabular forms, and the term also refers to an emotionally distant person or a type of lettuce. Characteristics Ø Origin: Forms from glaciers or ice shelves that reach the sea, a process called "calving". Ø Size: Must be over 15 meters (about 50 feet) long to be an iceberg, with smaller pieces called "bergy bits" or "growlers". Ø Appearance: Often white, but can appear blue due to compressed ice; tabular ones have flat tops, while others are irregular. Ø Visibility: Only about 10-11% is visible above water, creating the famous "tip of the iceberg" phenomenon. Ø Location: Found in Polar Regions (Antarctica, Arctic) and glacial lakes. Other meanings: Ø Figurative: An emotionally cold or reserved person, as in "a cold iceberg". Ø Lettuce: A crisp, pale green lettuce variety with mild flavour, known for its crunch. Ø Technology: Apache Iceberg is an open-source data lake table format for large datasets.