Glacial Erosion Landforms - Corrie Flashcards Preview

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Flashcards in Glacial Erosion Landforms - Corrie Deck (11)
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1

What is the starting point of a glacier?

Usually corries.

2

Other worlds for corries.

Cwms.
Cirques.

3

Describe the formation of a corrie.

Snowflakes collect in a hollow.
As more snow falls, the snow is compressed and the air is squeezed out to become firn or neve.
With the pressure of more layers of snow , the firn other thousands of years become glacier ice.

4

What makes the hollow bigger?

Erosion and weathering by abrasion.
Plucking.
Freeze-thaw weathering.

5

Even though the ice trapped in a hollow and unable to move down hill, what happens?

Gravity will still encourage it to move.

6

What does rotational slip cause?

The ice to pull away from the back wall creating a crevasse or bergschrund.

7

What does plucked debris from the back wall cause?

Further erosion through abrasion which deepens the corrie.

8

Where is some debris deposited?

At the edge of the corrie, building up the lip.

9

These processes create what?

A characteristic rounded, armchair shaped hollow with a steep back wall.

10

What happens when the ice in the corrie melts?

A circular lake is often formed at the bottom of the hollow, known as a tarn.

11

Give an example of a tarn>

Red Tarn on the eastern flank of Helvellyn.