Icebergs in the Antarctic area sometimes have a line formed by layers of snow that react in different conditions. blue line is often made when a gap in the ice filled with a mix of water freezes so quickly that no bubbles form.
When an iceberg falls into the sea, a layer of salty seawater can freeze the bottom. If this is rich in algae, can form a green line. Brown, black and yellow is the color of the line caused by sediment collected when sucked down into the sea ice.
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