Images of a lab dug into one of Norway's glaciers.
Glaciers are essentially giant rivers of ice that are formed over eons as fallen snow is compressed into layers of ice. Glaciers are found on about 10 percent of Earth's land area, with most of them found in the Arctic and Antarctica regions, but some occurring high up on mountains, even in tropical areas. Glacial ice makes up the ice sheets that cover Antarctica and Greenland, with glaciers flowing out to sea, where their ends float on the water as ice shelves. Eventually pieces of the ice shelves break off, or calve, to form icebergs. The movement of glaciers scours the underlying rock, and a glacier's movement can be affected by climate change, with worries that global warming could cause substantial glacial melt and impact global sea levels. For the latest news on glacier research and stunning views of these rivers of ice, see below.
Researchers find that thousands of metric gigatons of ice have been lost from Greenland and Antarctica
If you took the ice in all of Earth's mountain glaciers, it would make a cube with 34-mile-long sides.
Three American Navy fliers were buried in Antarctica after their plane crashed. Now explorers want to recover their remains.