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 meltwater 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
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