Glacial Erosion Landforms - Corrie Flashcards

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1
Q

What is the starting point of a glacier?

A

Usually corries.

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2
Q

Other worlds for corries.

A

Cwms.

Cirques.

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3
Q

Describe the formation of a corrie.

A

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.

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4
Q

What makes the hollow bigger?

A

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

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5
Q

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

A

Gravity will still encourage it to move.

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6
Q

What does rotational slip cause?

A

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

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7
Q

What does plucked debris from the back wall cause?

A

Further erosion through abrasion which deepens the corrie.

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8
Q

Where is some debris deposited?

A

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

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9
Q

These processes create what?

A

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

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10
Q

What happens when the ice in the corrie melts?

A

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

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11
Q

Give an example of a tarn>

A

Red Tarn on the eastern flank of Helvellyn.

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