Types of Movement

Question 1

Basal Slip

Answer 1

Base achieves PMP
Meltwater lubrication
Rapid slip over bedrock

Question 2

Internal Deformation

Answer 2

Weight of glacier ice + gravity
Ice crystals deform
Slow downslope movement

Question 3

Forms of basal slip

Answer 3

Creep
Regelation
Extensional + Compressional Flow

Question 4

Creep

Answer 4

Bedrock obstacle
Increase in pressure
Localised PMP + melting

Question 5

Regelation

Answer 5

Melting under pressure
Refreezing once pressure is reduced

Question 6

Extensional Flow

Answer 6

Downvalley ice pulling away from upvalley ice
Velocity increases

Question 7

Compressional Flow

Answer 7

Upvalley ice pushing against downvalley ice
Velocity falls