Periglaxial Landforms

Question 1

Ice wedge polygons

Answer 1

Fills with meltwater in the summer process repeats creating larger cracks

Question 2

Patterned ground

Answer 2

In periglacial areas and areas affected by seasonal frost, repeated freezing and thawing of groundwater forces larger stones toward the surface, as smaller stones flow and settle underneath larger stones. At the surface, areas that are rich in larger stones contain much less water than highly porous areas of finer grained sediments. These water-saturated areas of finer sediments have a much greater ability to expand and contract as freezing and thawing occur, leading to lateral forces which ultimately pile larger stones into clusters and stripes

Question 4

Pingos

Answer 4

Pressure pushes water upwards into the permafrost zone
This freezes creating ice lenses
This pushes the land abound it up to a dome which can collapse

Question 5

Nivation hollows

Answer 5

Persistent snow cover can create erosion Combined with weathering can sometimes lead to the formation of a corrie

Question 6

Loess

Answer 6

Wind blown sediment creating large areas of outwash plains

Question 7

Braided rivers

Answer 7

Seasonal melting creates significant amount of water creating erosion

Question 8

Screw slopes

Answer 8

Accumulation of rock fragments weathered from valley sides and cliffs

Question 9

Terraced benches and Coombes

Answer 9

Ridges formed by soliduction occurs on 10-20° slopes