Radar image of a two kilometre cross-section of the Carlson Inlet in West Antarctica, showing the structure of the ice sheet. The differences seen in the folding of the layers of the ice sheet are due to differences in speed. The left hand side is moving quickly (180 metres per year), resulting in tightly folded layers. The right hand side is moving much more slowly (35 meters per year), resulting in gently undulating layers. The greatest folding is seen where the fast-moving ice sheers past the slow-moving ice. Understanding ice flow will help scientists predict future Antarctic ice sheet loss.