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What you should know by the end of this lesson:
What you should know by the end of this lesson:
Formation of a an Arete
Formation of a Pyramidal Peak
Important!!
Important!!
When explaining the formation of Glacial features you NEED to discuss the processes involved. This is a very easy way to pick up marks! As you get a mark for naming the process and a mark for explaining how the process works. You get credited for up to 2 glacial processes per feature.
For the erosional features, all of the processes are the same. Regardless of the erosional feature make sure you discuss Abrasion and Plucking!
Arete
Arete
REMEMBER!
When answering these as a full Higher Question you need to explain the processes which are involved in these formations. A well-explained process can gain you 2 marks, 1 mark for naming the process and 1 mark for explaining the process, but you need to have both to gain both marks.
The same goes for every process term you say
Striding Edge - An Arete
These features are straight forward and your task is simply to try and understand the processes which explain how they form
Digital Workbook and Paper Jotter
Draw the annotated diagram into your jotter
Write the full explanation to your notes below your diagram
Diagram
Diagram
During Glaciation
During Glaciation
After Glaciation
After Glaciation
Explanation (this colour is the same as a corrie)
Explanation (this colour is the same as a corrie)
Before Glaciation
Snow accumulates in north-facing hollows when more snow falls in winter than melts in the summer
North and North-East slopes are more shaded so snow lies longer.
As snow accumulates it is compressed down (neve) squeezing out air and eventually forming glacial ice
Glacial ice is really heavy and begins to flow downhill due to gravity.
During Glaciation
As the glacier moves in a rotational movement because of the slope it erodes the hollow downwards.
Erosion occurs through the processes of Plucking (Explain term) and Abrasion(explain term)
The maximum vertical erosion is under the deepest part of the ice.
This creates a steep back wall and a hollow known as a Corrie.
As the hollow deepens a gap appears between the glacier and the back wall of the Corrie. Known as a bergschrund, this gap allows more rocks and boulders to be taken into the glacier.
As the glacier becomes shallow it loses energy and rocks get deposited creating a rock lip.
After Ice Age
When two corries form back to back, a narrow ridge is formed in-between them called an arête
Frost shattering continues to sharpen the ridge leaving it jagged and rocky.
A well known arête is, Striding Edge in the Lake District
Top Tip!
Top Tip!
for erosional processes, you can get an extra mark for a named example of the feature!
Pyramidal Peak
Pyramidal Peak
The Matterhorn - A Pyramidal Peak
No Diagram
No Diagram
Explanation (this colour is the same as a corrie)
Explanation (this colour is the same as a corrie)
Before Glaciation
Snow accumulates in north-facing hollows when more snow falls in winter than melts in the summer
North and North-East slopes are more shaded so snow lies longer.
As snow accumulates it is compressed down (neve) squeezing out air and eventually forming glacial ice
Glacial ice is really heavy and begins to flow downhill due to gravity.
During Glaciation
As the glacier moves in a rotational movement because of the slope it erodes the hollow downwards.
Erosion occurs through the processes of Plucking (Explain term) and Abrasion(explain term)
The maximum vertical erosion is under the deepest part of the ice.
This creates a steep back wall and a hollow known as a Corrie.
As the hollow deepens a gap appears between the glacier and the back wall of the Corrie. Known as a bergschrund, this gap allows more rocks and boulders to be taken into the glacier.
As the glacier becomes shallow it loses energy and rocks get deposited creating a rock lip.
After Ice Age
When three or more corries form back to back, the narrow ridged aretes rise to a central point known as a Pyramidal Peak
Frost shattering continues to sharpen the ridge leaving it jagged and rocky.
A well known pyramidal peak is, The Matterhorn
Well done you have finished lesson 4 of Glacial Landscapes.
Well done you have finished lesson 4 of Glacial Landscapes.
Return to the topic launch page and attempt the lesson quiz
Return to the topic launch page and attempt the lesson quiz
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