Enquiry question three

Question 1

What factors affect the rate of glacial erosion/movement

Answer 1

• basal temperature
• ice thickness
• precipitation levels
• ice and slope gradient
• bedrock permeability
• rates of ablation

Question 2

What are the four glacial processes?

Answer 2

1- Erosion:
The removal of material via plucking, abrasion, fracture and dilation

2- Entrainment
Small rock fragments are trapped (entrained) by basal ice freezing around them which pulls them along

3- Transport
Rock debris is transported on the surface (supraglacial) within the ice (englacical) and at the base (subglacial)

4- Deposition
Glacial till (sediment deposited by the glacier ice)
Fluvio-glacial debris is deposited by glacial meltwater