- Internal Deformation can occur in both Warm and also Cold Based Glaciers.
- Involves Ice Crystals Slipping and Sliding over each other.
- The crystals can also become deformed and fractured due to the force of gravity downhill.
- It usually occurs at the same time as Basal Sliding.
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- Involves movement of a large block of ice
- In series of short jerks
- Meltwater forms on the upslope side of obstacles on the valley floor, which increases resistance
- This increases Presssure, causing localised melting of the ice
- Called Pressure melting
- Meltwater allows the ice to flow up
- On the other side of the obstacle it will often then refreeze the meltwater.
- Due to there being less pressure.
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- Occurs when there is a sudden steep gradient in front of the ice
- The ice flows down the gradient faster and becomes thinner
- Overstretching in the ice results in the formation of glaciers
- When the ice reaches the end of the steep gradient, compressional flow begins
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- A reduction in gradient slows the ice's flow
- The Ice then piles up at the bottom of the gradient, becoming thicker
- This is called Compressional Flow
- Crevasses opened up by extensional flow will now be closed
- In the centre of the gradient, rotational movement takes place
- This is the movement that forms Corries
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