erosional landforms

Question 1

name all the erosional landforms

Answer 1

corries, arêtes, glacial troughs, hanging valleys, truncated spurs, roche moutonnees, ribbon lakes

Question 2

corries

Answer 2

they are formed by deepening the bedrock through rotation, this leads to ice rotating downhill. abrasion and plucking promote development of steep back wall and water flows down a bergschrund and encourages freeze thaw to make corrie bigger

Question 3

arêtes and pyramidal peak

Answer 3

when two neighbouring corries erode backwards to each other becoming narrow and a knife ridge is formed. more than 2= pyramidal peak

Question 4

glacial troughs

Answer 4

as glacier moves down a valley, erosion creates a u-shaped valley with freeze thaw and weathering wreaking rocks at the side of the valley. as well as plucking ice to tear pieces away

Question 5

truncated spurs

Answer 5

interlocking spurs are left behind from a river, abrasion and plucking erodes the tips of the spurs, steep cliff outcrops are left

Question 6

ribbon lakes

Answer 6

extensional flow within glacier can create more erosion in bedrock. deep narrow depression is created. so when glacier retreats, it can be filled with meltwater

Question 7

roche moutonee

Answer 7

ice melts upstream (stoss) and increased pressure results to a smooth surface on the stoss side. as pressure reduces, the water refreshes downstream and plucks the rock that has been frozen. leaving jagged surface in the lee side