Erosional landforms

• how are corries formed and what do they look like?

  arm chair shaped hollows found on upland hills or mountainsides. they have a steep back wall and over-deepened basin. they are formed with nivation of a small hollow in which snow collects and accumulates. overtime the hollows enlarge and contain more snow which eventually compresses into glacier ice. the weight enlarges the hollow and plucking makes the back wall steeper.
• how is a tarn formed?

  corrie that has been filled with water creating a lake
• what is an arête and how is It formed?

  an arete is a narrow, steep sided ridge found between two corries. They form from glacial erosion as two corries erode backwards plucking and abrading the back wall until it becomes a narrow path. An example is striding edge
• what is a pyramidal peak and how are they formed?

  Where three or more corries develop around a mountain and they erode backwards through plucking and abrasion which then steepens unto it becomes a peak.
• What are u shaped vallyes (troughs) and how are they formed?

  Glaciers flow down pre-existing river valleys under gravity. As they move they erode the sides and floor of the valley, causing the shape to become deeper, wider and straighter.
• what is a roche moutonée and how is it formed?

  projections of more resistant rock what create pressure of the glacier which causes melting this side gets smoother by abrasion as the meltwater helps the glacier slide over the rock. As the glacier moves over the down valley side of the rock the pressure is reduced and the meltwater refreezes this results in plucking and steepening. this side is therefore rough and jagged.