Ice movement Flashcards
1
Q
What is internal deformation?
A
Ice crystals orienting themselves in the direction of flow, allowing them to slide over each other.
2
Q
What is rotational flow?
A
Occurring within a corrie, ice pivots around a central point increasing erosion and pressure.
3
Q
What is compressional flow?
A
When the valley floors gradient reduces, ice compacts and erosion is at its best.
4
Q
What is extensional flow?
A
When the valley floors gradient increases, ice thins and less erosion occurs.
5
Q
What is Basal sliding?
A
When pressure melting occurs at the base of a glacier, melt water acts as a lubricant allowing the ice to ‘slide’ over the bedrock.
6
Q
What are surges?
A
excessive build up of melt water results in rapid movement in the glacial mass.
