Periglacial Landforms

Question 1

Patterned grounds

Answer 1

Frost heave and ice lenses pull rocks up to the surface, this then forms 2 landforms, stone polygons if it is on a slope less than 6° or stone stripes if it is more than 6°

Question 2

Ice wedges

Answer 2

Forms due to a gap in the permafrost, creating water in the soil which can freeze and widen the gap due to freeze thaw

Question 3

Pingos

Answer 3

Freezing water in the upper layers of discontinuous permafrost causes sediment to rise and create a dome shape. This is an open pingo

In low lying areas of permafrost a closed pingo forms. If a small lake is present, ground water can be trapped by the permafrost below and in the lake above. the ground water freezes and expands

Question 4

Blockfields

Answer 4

Freeze thaw weathering creating large angular rocks

Question 5

Solifluction

Answer 5

Downslope movement of rocks and soil due to gravity acting on the active layer in summer, this melts in spring and slumps.