Erosion Landforms - Glaciation

Question 1

What is an Arête?

Answer 1

Arêtes are narrow ridges which form when two corries erode back to back.

Question 2

What is a pyramidal peak?

Answer 2

Pyramidal peaks are peaks that form when three or more corries form a single Preakness where arêtes meet.

Question 3

What is a corries?

Answer 3

Corries are bowl shaped hollows that form with a steep back wall and ridges, forming an armchair shape around a hollow sometimes containing a small round lake called a tarn.

Question 4

What is a corries?

Answer 4

Corries are bowl shaped hollows that form with a steep back wall and ridges, forming an armchair shape around a hollow sometimes containing a small round lake called a tarn.

Question 5

Ow are corries formed?

Answer 5

1) Snow accumulates
2) The snow becomes glacial ice
3) Some of it starts to flow to lower levels
4) Ice becomes frozen to the back wall of the hollow ad plucking occurs as the ice moves downhill
5) This makes the back wall steeper
6) Freeze thaw weathering takes place at the top of the slope producing scree
7) The hollow deepens where the ice is thickest due to abrasion
8) There is less erosion at the front and a rock lip forms here
9) When all the ice has melted a tarn (lake) forms