Glaciation

Question 1

How does a Corrie form?

Answer 1

-Snow falls and accumulates in north facing hollows
-The snow compresses to form nève (ice)
-Pulled downhill because of gravity
-Ice melts, goes into cracks of rocks, freezes, repeats, which wears down rock, causing it to break apart (Freeze Thaw)
-As ice goes down, it sticks to mountain walls, plucking rocks (Plucking)
-When scree and neve move against Corrie walls and floor, it acts as sandpaper (Abrasion) which makes the corrie steeper
-Because of its rotational movement, the glacier leaves the front less eroded which forms a rock lip
-After the ice ice, a lake called a ‘tarn’ is left at the base of the corrie

Question 2

What is an arête?

Answer 2

When 2 Corries form back to back.

Question 3

What is a corrie?

Answer 3

A corrie is an armchair shaped mountain hollow with a steep back and walls which may have a tarn at its base.

Question 4

What is a pyramidal peak?

Answer 4

When three or more corrie erode backwards into the same mountain.

Question 5

What are U-shaped valleys?

Answer 5

U-shaped valleys are large valleys in the shape of a U which made through glacial erosion.

Question 6

How are glacial areas used?

Answer 6

Farming, forestry, industry, recreation and tourism, water storage and supply, renewable energy

Question 7

What are 3 glacial processes of erosion?

Answer 7

Freeze thaw, plucking and abrasion

Question 8

What is freeze thaw?

Answer 8

When water gets into crack in the rocks, freezes, expands, and further cracks the rock. After a continuation of this process, the rocks break apart.

Question 9

What is plucking?

Answer 9

Ice freezes and sticks to the corrie walls, and plucks rocks from the walls.

Question 10

What is abrasion?

Answer 10

When rocks carried by a glacier act like sandpaper and scrape away the base and sides of a corrie, making is steeper.