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 melt 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.
