Huge cracks in the Greenland Ice Sheet have grown significantly wider and deeper in just five years, new 3D maps reveal. The finding suggests the landmass is unzipping faster than scientists previously thought.
Most of these cracks, called crevasses, sit around the edges of the ice sheet, where they funnel ice and meltwater into the ocean. But the fissures also siphon meltwater and heat toward glaciers inland, which researchers say could trigger a "domino effect" that would lead to catastrophic melt and sea level rise.
