With beautiful black, blue and even green stripes, some of these icebergs could pass for man-made works of art instead of simple quirks of nature. These marble-like colourful lines and veins in their ice are formed by frozen melt water, sediment and even algae combined with huge pressures. More specifically, the blue stripes are created when gaps in the icebergs fill with melt water which freezes, while green veins are left when seawater rich with algae freezes to the bottom of the bergs. Continue reading for more incredible phenomena that occur naturally on Earth.