Icebergs in the Antarctic area sometimes have stripes,
formed by layers of snow that react to different conditions.
Blue stripes are often created when a crevice in the ice sheet
fills up with melted water and freezes so quickly that no
bubbles form.
When an iceberg falls into the sea, a layer of salty seawater
can freeze to the underside. If this is rich in algae,
it can form a green stripe.
Brown, black and yellow lines are caused by sediment,
picked up when the ice sheet grinds downhill
towards the sea.
