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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.