glaciation erosion features

Question 1

formation of a pyramidal peak

Answer 1

the formation of a corrie and three back to back corries that erode to form a peak. frost shattering erodes the ridges further into a steep knife shape and then the pyramidal peak is formed

Question 2

formation of a arete/knife edge ridge

Answer 2

formation of a corrie and two back to back corries that erode into a ridge, frost shattering erodes the ridge futher into a steep knife shape

Question 3

FORMATION OF A CORRIE

Answer 3

glacier moves downhill due to gravity, bergschrund crevasse opens up at the back of the hollow, which allows meltwater and rock fragments to get to the base of the glacier increasing erosive power. the weight of the glacier pushes down causing rotational sliding, which over deepens the hollow. friction causes the ice to slow down at the front edge of the corrie, allowing a rock lip to form which traps rain water. an example of a corrie is brown cove

Question 4

explain berschrund crevasse

Answer 4

a crack in the ice which opens up at the back of the hollow between the glacier and the mountain, which allows meltwater and rock fragments to get to the base of the glacier, increasing erosive power

Question 5

explain rotational slip

Answer 5

when the weight of the glacier pushes down causing a rotational sliding, which over deepens the hollow

Question 6

explain a rock lip

Answer 6

friction causes the ice to slowdown at the front of the edge of the corrie and then the rock lip traps the rain water

Question 7

example of a corrie (worth 1 mark)

Answer 7

red tarn on helvellyn