Ans) The majority of icebergs are white, but some may appear blue or even green. Ice is made up of tiny air bubbles that scatter all colour wavelengths equally, giving it a white appearance. When ice is compressed, the bubbles are squeezed out and blue light is scattered much more than other colours, giving the ice a blue appearance. Algae frequently grow on the undersides of sea ice and icebergs, producing green stripes that are only revealed when the ice rolls over, exposing previously underwater sections.