What are glaciers?
Glaciers are large masses of ice that form over hundreds, or thousands of years from layers of compressed snow. They move very slowly and are sometimes referred to as ‘rivers of ice’.
There are two main types of glaciers, Valley glaciers and Continental glaciers.
Valley Glaciers mainly form in cold mountain ranges where snow still accumulates, for example in the Alps. The glaciers then flow slowly down the valley.
Continental Glaciers are extremely slow moving thick ice sheets that cover part of a continent, for example in Antarctica. In Antarctica ice forms a dome in the centre of the continent and extremely slowly moves down towards the edges of the ice sheet.