Unlike floating ice formations, water originating from the larger masses of ice on land introduces more water that raises the overall sea level worldwide. (techtimes.com)
The movement of these large masses of ice also leaves distinct marks on the walls of valleys and in the form of deposits of glacial sediment. (scientificamerican.com)
That could potentially open the gates to the great mass of ice stacked up behind it - and more significant sea level rises. (earthtimes.org)