Lecture 11: Periglacial Landforms & Processes

Question 1

Permafrost

Answer 1

Sediment remaining at or below 0 degrees for at least 2 years

Question 2

Types of permafrost

Answer 2

Continuous, discontinuous, sporadic and isolated

Question 3

Active layer

Answer 3

The layer of permafrost that thaws and freezes annually

Question 4

Taliks

Answer 4

Warmer ground through permafrost

Question 5

Epigenetic ice

Answer 5

Ice forming in existing sediments

Question 6

Syngenetic ice

Answer 6

Ice forming in new accumulating sediments

Question 7

Interstitial ice

Answer 7

Ice forming in between soil particles

Question 8

Segregated ice

Answer 8

Ice occupying all pores and forming ice masses in the soil

Question 9

Frost heave

Answer 9

Upward movement of ground surface due to segregated ice formation

Question 10

Pingos

Answer 10

Dome-shaped, ice-cored hills

Question 11

Palsas

Answer 11

Peat-covered ice core mound

Question 12

Rock glacier

Answer 12

Mass of rocks and ice

Question 13

Solifluction lobes

Answer 13

Movement of saturated soil in the active layer

Question 14

Thermokarst lakes

Answer 14

Formed by thawing of permafrost, excess water

Question 15

Tors

Answer 15

Exposed rock masses rising from the surrounding landscapes; weathering or freeze-thaw

Question 16

Aufeis

Answer 16

Sheet-like mass of layered ice

Question 17

Types of sorted ground patterns

Answer 17

Polygons, stripes and circles