What causes glaciers to melt from below? Today’s Video of the Day from NASA Earth Observatory explains why many of Greenland’s glaciers are melting from below.
Scientists with the Oceans Melting Greenland (OMG) mission have been surveying more than 200 glaciers over the past five years.
The researchers found that glaciers in deep fjords come into contact with more warm water, which causes undercutting. During this process, warm seawater melts the base of the glacier and causes the ice to break apart. A glacier is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years. Also Glaciers slowly form and flow under stresses induced by their weight, creating crevasses, seracs, and other distinguishing features. They also abrade rock and debris from their substrate to create landforms such as cirques, moraines, or fjords. Glaciers form only on land and are distinct from the much thinner sea ice and lake ice that forms on the surface of bodies of water. So you ask What causes glaciers to melt from below? Its from the climate and warm weather.
Video Credit: NASA Earth Observatory
By Chrissy Sexton, Earth.com Staff Writer