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Green appears because the water that freezes is extremely rich in algae, hence the colour. Brown, yellow, and even black stripes are caused by sediments picked up along the way when the ice sheet was sliding downhill.

Antarctica iceberg: Green appears because the water that freezes is extremely rich in algae, hence the colour. Brown, yellow, and even black stripes are caused by sediments picked up along the way when the ice sheet was sliding downhill.