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   At first snow collects in a natural hollow on a
    mountain (at a high altitude/above the firn
    line).
    Over time this snow is compressed by the pile
    up of more snow on top of it. This extra weight
    forces air partials out, and thus more
    denser, compacted, recrystallised ‘firn’ snow is
    created (this snow eventually turns into
    ice, which will form part of the glacier.
   Although the ice is trapped inside a hollow, the
    gravitational potential energy created by it, forces erosion
    to occur.
   This erosion (at first) comes in the form of ‘plucking’
    (where dense ice picks at the wall behind it). This
    wall, known later as the headwall/backwall, forms the
    main basis of the corrie.
   Plucking induces abrasion (process where rock gained
    from plucking erodes away at bedrock) to occur also.
    These collectively widen and increase the volume of the
    cirque. These two processes are often given ‘zones’ (i.e.
    The ‘zone of plucking/abrasion).
   Weathering, further down the corrie (away from the
    plucking ice) happens as well. This is freeze-thaw
    weathering – where water seeps into porous rock
    formations and sets as ice; this expansion of ice, forces the
    rock to break.
A bergschrund is normally formed when the
 natural rotation of the glacier causes the
                                                    The circular erosion
 inactive /stationary ice (ice not moving as fast
                                                    patterns of the forming
 as ice nearer the tip of the glacier) to break
                                                    glacier can cause a
 from the ‘bulk’.
                                                    bergschrund to appear.




A
burgschrund
can reach up
to 100 meters
in depth.
   Over quantities of time, the corrie becomes arm chair-shaped.
    The cirque (which is actually French for ‘Arena’) normally
    gains three obvious sides as well.
   One is the noticeable Backwall and the other two (in this
    analogy – the ‘arms’) are steep cliffs. Nonetheless these can
    become knife-edged ridges known as arêtes (if two corries
    erode towards it)
   However there is a fourth; this is called the rock lip. The rock
    lip (easier to see when the glacier has retreated/melted) is
    formed when debris/moraine collects at the basin of the
    hollow. The glacier flows through here when it is finally
    forced out with the aid of gravity.
   Lastly a pyramidal peak can be created if three or more
    corries erode towards one another (this occurs when
    backwalls are forced to meet, by erosion).
   When the ice within a corrie melts a lake, called a tarn lake is often left behind. This
    is seasonal and freezes in deep winter. Finally the reason why it is able to form is
    because of the rock lip (which was created by moraine and collected debris at the
    bottom of the cirque).
I showed you this image earlier, now name the parts!
                You have 1 minute!


           1

                  2                    3


                          4
       7                           5
                      6
1.   Steep back wall.
2.    Burgschrund.
3.   Moraine.
4.   Rotation of glacial erosion.
5.   Corrie/Cirque lip or Rock lip.
6.   Abrasion of bedrock.
7.   Plucking of the backwall/ headwall(as ice
     forms around rock fragments).

     Thank you.

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Corries

  • 1.
  • 2. At first snow collects in a natural hollow on a mountain (at a high altitude/above the firn line).  Over time this snow is compressed by the pile up of more snow on top of it. This extra weight forces air partials out, and thus more denser, compacted, recrystallised ‘firn’ snow is created (this snow eventually turns into ice, which will form part of the glacier.
  • 3. Although the ice is trapped inside a hollow, the gravitational potential energy created by it, forces erosion to occur.  This erosion (at first) comes in the form of ‘plucking’ (where dense ice picks at the wall behind it). This wall, known later as the headwall/backwall, forms the main basis of the corrie.  Plucking induces abrasion (process where rock gained from plucking erodes away at bedrock) to occur also. These collectively widen and increase the volume of the cirque. These two processes are often given ‘zones’ (i.e. The ‘zone of plucking/abrasion).  Weathering, further down the corrie (away from the plucking ice) happens as well. This is freeze-thaw weathering – where water seeps into porous rock formations and sets as ice; this expansion of ice, forces the rock to break.
  • 4. A bergschrund is normally formed when the natural rotation of the glacier causes the The circular erosion inactive /stationary ice (ice not moving as fast patterns of the forming as ice nearer the tip of the glacier) to break glacier can cause a from the ‘bulk’. bergschrund to appear. A burgschrund can reach up to 100 meters in depth.
  • 5. Over quantities of time, the corrie becomes arm chair-shaped. The cirque (which is actually French for ‘Arena’) normally gains three obvious sides as well.  One is the noticeable Backwall and the other two (in this analogy – the ‘arms’) are steep cliffs. Nonetheless these can become knife-edged ridges known as arêtes (if two corries erode towards it)  However there is a fourth; this is called the rock lip. The rock lip (easier to see when the glacier has retreated/melted) is formed when debris/moraine collects at the basin of the hollow. The glacier flows through here when it is finally forced out with the aid of gravity.  Lastly a pyramidal peak can be created if three or more corries erode towards one another (this occurs when backwalls are forced to meet, by erosion).
  • 6. When the ice within a corrie melts a lake, called a tarn lake is often left behind. This is seasonal and freezes in deep winter. Finally the reason why it is able to form is because of the rock lip (which was created by moraine and collected debris at the bottom of the cirque).
  • 7. I showed you this image earlier, now name the parts! You have 1 minute! 1 2 3 4 7 5 6
  • 8. 1. Steep back wall. 2. Burgschrund. 3. Moraine. 4. Rotation of glacial erosion. 5. Corrie/Cirque lip or Rock lip. 6. Abrasion of bedrock. 7. Plucking of the backwall/ headwall(as ice forms around rock fragments). Thank you.