Periglacial landscapes

Question 1

What are 3 pereglacial processes?

Answer 1

1) frost heave
2) ice lensing
3) solifluction

Question 2

What is frost heave?

Answer 2

moisture in soil freezes, it expands and the ground shifts up

Question 3

What is ice lensing?

Answer 3

Moisture under stones freezes and expands and pushes the stone upwards

Question 4

What is solifluction?

Answer 4

Frost heave on a slope, when it thaws it goes diagnology down

Question 5

What are two pereglcaial land forms/ features and what are they?

Answer 5

1) Patterned ground= number of small scale features, that are a result of frost heave (stones that have reached the surface)
2) Pingos=Round ice-cored hills

Question 6

What are the two types of pingos?

Answer 6

1) Open system= forms in valley bottoms where water from surrounding slopes collects, freezes and expands
2) Closed systems= developed beneath lake beds. Groundwater beneath a lake is trapped by the permafrost