Iceberg (Typical)

A massive chunk of freshwater ice floating in the ocean/Nature & Natural Wonders

A typical large iceberg is roughly 100-200 m long at the waterline, 50-100 m wide, and extends 70-100 m above the surface. Since ice is less dense than seawater, about 90% of an iceberg's mass lies below the waterline (the origin of the phrase 'tip of the iceberg'). A large iceberg might weigh 10-20 million tonnes. Icebergs calve from glaciers and ice shelves; the largest ever recorded (B-15, from the Ross Ice Shelf in 2000) was 295 km long and 37 km wide, larger than Jamaica.