The formation of glaciated upland features


Formation of a corrieFormation of a corrie

  • Snow gathers in mountain hollows - especially north facing hollows - it builds up and compacts to ice.
  • As the ice moves downhill it sticks to the back wall and plucks rock from the surface, steepening them.
  • Freeze thaw action also loosens rocks on the back wall.
  • Ice moving with loose rock acts like sandpaper and deepens the hollow by abrasion.
  • Ice in a corrie has a rotational movement which means that the front of the corrie is less eroded and a lip forms.
  • The glacier melts, often leaving a tarn/corrie loch.