Above, Ohio State University researchers and their colleagues are using the interference between different radar signals to reveal the land beneath the ice in Greenland . The interference pattern resembles the rainbow effect on an oily puddle. Image courtesy of Ohio State University.

Below, the radar signal of sub-glacial Greenland topography obtained by the Global Ice Sheet Mapping Orbiter (GISMO) system in May 2006. The image combines both the vertical and horizontal elements of the 3D radar data. The left half of the image shows the vertical layers of ice from the surface down to the base of the ice sheet (white line, center) and the right half of the image shows the horizontal view of the topography of the land beneath the ice. Image courtesy of Ohio State University .

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