An iceberg is a piece of freshwater ice more than 15 meters (16 yards) long [ 1 ] that has broken off a glacier or an ice shelf and is floating freely in open water. [ 2 ][ 3 ] Smaller chunks of floating glacially derived ice are called "growlers" or "bergy bits". [ 4 ][ 5 ] Much of an iceberg is below the water's surface, which led to the expre... More @Wikipedia
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