Deeper and Longer Greenland Canyons = Higher Sea Levels | Topography Video

The below-sea-level canyons beneath the ocean-feeding glacier cut further inland than previously estimates. Accelerated ice loss of the glacier was thought to be limited, but this finding calls into question its duration. Greenland's 'Grand Canyon' Revealed

Scientists at NASA and the University of California, Irvine made the find.

credit : NASA / JPL