Blue Ice
Most icebergs are white in colour, but some may appear blue or even green. Ice is full of tiny air bubbles that scatter all colour wavelengths the same amount, giving the ice a white appearance. If the ice is compressed, the bubbles are squeezed out and the blue light is scattered much more than other colours – making the ice appear blue. Algae often grow on the underside of sea ice and icebergs, producing green stripes that are only revealed when the ice rolls over and exposes the previously underwater sections. Approximately 90 percent of an iceberg is found under water. The dark "stains""are from gravel, sand and mud picked up as the glacier moved towards the sea.
Blue Ice
Most icebergs are white in colour, but some may appear blue or even green. Ice is full of tiny air bubbles that scatter all colour wavelengths the same amount, giving the ice a white appearance. If the ice is compressed, the bubbles are squeezed out and the blue light is scattered much more than other colours – making the ice appear blue. Algae often grow on the underside of sea ice and icebergs, producing green stripes that are only revealed when the ice rolls over and exposes the previously underwater sections. Approximately 90 percent of an iceberg is found under water. The dark "stains""are from gravel, sand and mud picked up as the glacier moved towards the sea.