Glaciated Uplands Flashcards
what is plucking?
when a glacier freezes to the underlying landscape and rips out rocks as it moves downhill.
what is abrasion in the mountains?
rocks plucked out freeze to the bottom of the glacier and scour away the underlying landscape as it moves, having a sandpaper effect
what is freeze-thaw weathering?
water enters cracks in rock and expands as it freezes, widening the crack. When repeated it weakens and eventually breaks the rock.
Describe a corrie?
deep, steep sided horseshore shaped hollow high on a mountainside.
name an example of a corrie
Corrie Cas
Describe an arete?
steep, narrow ridge that forms between two corries back to back.
name an example of an arete
Fiacaill a Corrie Cas
Describe a pyramidal peak?
sharp pointed peak atop a mountain that forms when three or more corries form back to back.
name an example of a pyramidal peak
Angels Peak
Describe a u-shaped valley?
wide, flat bottomed and steep sided valley.
name an example of a u-shaped valley
Glen Einich / Avon
How many corries does an arete need to form?
Two
How many corries does a pyramidal peak need to form?
Three
In what direction does snow gather in a hollow?
North
Why do glaciers move downhill?
Gravity
What can be found on the bottom of a u-shaped following once the glaciers have melted?
Misfit stream or ribbon loch
what process of erosion has a sandpaper effect?
Abrasion
what is a truncated spur?
craggy and steep area of land at the endge of a u-shaped valley/ chopped off interlocking spur
how do glaciers affect interlocking spurs in a v-shaped valley?
chop them off to create truncated spurs
what is Fiacaill a Coire Cas an example of?
Arete
What is Glen Avon an example of?
U-shaped valley
What is Angels Peak an example of?
Pyramidal Peak
what does a truncated spur look like on a OS map?
A ridge of land that leads towards the valley and is suddenly cut-off. Steep and craggy area on the side of a u-shaped valley.
why is sheep farming common in the Cairgorms?
sheep are hardy and can survive the harsh conditions, unsuitable for growing crops, poor climate and slopes are too steep for machinery