Glaciers Flashcards

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1
Q

What are the 3 erosional processes in a glacier

A

Plucking
Freeze-thaw weathering
Abrasion

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2
Q

What is the accumulation zone

A

Is when there are inputs into the glacial budget

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3
Q

What is the ablation zone

A

Where thare are outputs from the glacial budgets

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4
Q

Why do glaciersgo down hill

A

Because of gravity

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5
Q

What is plucking

A

When meltwater freezes on the rock and when the glacier moves forward it pulls the rocks of the surface

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6
Q

What is abrasion

A

Rocks being carried by the glacier scrape away at the surface which deepens the glacier

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7
Q

What is freeze-thaw weathering

A

When water is forced into the cracks in the rock and when the water freezes it expands by 9% which enlargens the cracks and eventually breaks rocks of from the surface

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8
Q

What is the first step of a corrie being formed

A

Snow builds up in a hollow high above sea level and usually in a north faced dirrection.The snow compacts and turns from snow to fern and eventually to glacial blue ice.Once the glacier reaches the critical depth of 30 meters it becomes a glacier and is pulled down the mountain because of gravity

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9
Q

What is the second step in forming a corrie

A

Water enters the cracks in the rocks and when it freezes it expands by 9% which enlargens the cracks eventually the rocks are plucked out of the surface and taken with the glacier.

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10
Q

What is the final step in forming a corrie

A

When the glacier melts a corrie is formed which usually has a lake inside called a tarn but it doesn’t have to have one.

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11
Q

What is a cold environment

A

It is a area always coverd by ice and it can have glaciers or ice sheets

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12
Q

Are cold environments usually at low or high altitudes

A

High altitudes because it is much colder at high altitudes

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13
Q

What is a glacial budget

A

The name of the system of inputs,processes and outputs

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14
Q

What are some featurs of a corrie

A

They normally have a tarn but they don’t have to.They have a steep back wall aswell.

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15
Q

What is a example of a glacier retreating

A

The skibidi ohio sigma lost 7 inches

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