n Earth’s polar regions, large sheets of ice cover extensive areas of land, such as in Antarctica, where 97.7 per cent of its surface area is covered by permanent ice. These icy landscapes might appear completely stationary, but they are actually made of slowly moving glaciers. Because these landscapes are tightly packed with snow, which over time creates dense ice, some of the largest glaciers can weigh 10 million tonnes. When this ice creeps into the polar seas, small segments of this glacial
