glaciers
DESCRIPTION
Glaciers. In this weeks lessons we will be investigating Glaciers and how they erode, transport and deposit material. By the end of today's lesson you will be able to describe how corries are created. Complete worksheet 19.1 from The New Wider World Resource Booklet. Glacier System Revision. - PowerPoint PPT PresentationTRANSCRIPT
• In this weeks lessons we will be investigating Glaciers and how they erode, transport and deposit material.
• By the end of today's lesson you will be able to describe how corries are created.
• Complete worksheet 19.1 from The New Wider World Resource Booklet.
How is a corrie formed?
Snow collects in a natural hollow on the side of a mountain. Over time, further snow collects in the hollow. This extra weight compresses the snow underneath, turning it into ice.
The hollow is deepened and widened by the corrie glacier through the processes of abrasion and plucking.
rock lip
This overdeepening leads to an ‘armchair’ shape characteristic of a corrie and causes a ‘rock lip’ to be formed.
Corrie formation
Diagram of a corrie
Explain the formation of a corrie
tarn
bowl-shaped corrie
steep backwall
Example of a corrie: Cwm Idwal
Drawing a fieldsketch of Cwm Idwal
Fieldsketch of Cwm Idwal looking south-west
tarn
steep backwall
fence
shattered rock
• Copy diagram D on p235 Foundation The New Wider World.
• Complete question 3 p248