Ploughmarks formed by unusually flat-bottomed icebergs in the central Barents Sea (Red is 240m water depth; purple is 248m) It is as if a child has been doodling with large coloured crayons. What you see are actually the great gouge marks left on the seafloor when the keel of a giant block of ice has dragged through the sediments. The arcs and loops record the movement of the berg as it turns abou