There is an enormous mass of ice beneath the Greenland ice sheet, which has melted and refrozen making the sheet ragged and contoured on the surface.
Researchers at Columbia University have determined that when the ice refreezes, over hundreds to thousands of years, it radiates heat that uplifts, distorts and warms the ice above making it more likely to flow into the sea.
These findings will help scientists to understand the nature of the ice sheets and how they respond to climate change.
Read more at Columbia University