Icebergs are large pieces of ice that break off glaciers and float into the surrounding ocean. They can be pure white or streaked with blue and brown. Blue streaks come from melt water freezing in the cracks of the original glaciers. Brown streaks come from dust landing on the ice or erosion from the original glacier scraping the ground.
The shape and size of icebergs depends on their breakage and melt patterns, as well as waves, temperature, and the ice pack around them. Common shapes include tabular, blocky, wedge, pinnacle, domed, and drydock.
Tabular, or flat pieces of shelf ice that break off to form ice islands, are stable enough to use as mobile research platforms, while the more irregular shapes can break apart without warning. According to the Iceberg Finder, the largest iceberg ever recorded in the Arctic was recorded in 1882 near Baffin Island