1. Corrie, cirque, cwm – hollow where a glacier formed
Armchair shaped hollow – usually northerly aspect in UK and N. Hemisphere.
Steep back wall
e.g. Llyn Cau on Cader Idris

2. Llyn Cau -Corrie lake - Or tarn
Back wall of corrie – plucking
Overdeepening of hollow – abrasion
Rotational slip at base of glacier
Corrie lip at front edge

3. Looking down into a tarn
From high up on the backwall
Backwall subject to freeze thaw weathering in post-glacial – periglacial times

4. An arete
A knife edge ridge formed where two cories developed back to back
This example is Striding Edge on Helvellyn in the Lake District.

5. A pyramidal peak or horn
e.g. Matterhorn
Where 3 or more corries form back to back

6. A glacial trough or U shaped valley.
Steep sides are truncated spurs prexisting river valley profile altered by glacial erosion
Ice more effective at eroding by
Plucking and abrasion

8. A hanging valley and waterfall called Bird Woman Falls near Mt
A hanging valley and waterfall called Bird Woman Falls near Mt. Oberlin, Canadian Rockies.
A smaller tributary glacier could not erode the base of its valley as deep as the main valley glacier. Thus after the ice melts the smaller valley is left hanging above the main valley floor and enters it at up to 90*.

10. A fjord is a drowned glaciated valley.
The ice did not use present day sea level as its base level
The ice could erode much deeper than today’s sea level.
So after the Ice Age the sea enter and drowned glaciated valleys.
Many examples in Norway

11. Wastwater

12. In some areas the glaciated valley can be overdeepened by glacial erosion. Perhaps the rocks locally were less resistant.
Alluvial fans may be formed where a post glacial stream flows into the lake. The lake may be split into two.

13. Keswick lies between Derwentwater and Bassenthwaite
Keswick lies between Derwentwater and Bassenthwaite. Interlaken is another example.
Lakes are temporary features – they fill up with sediment or the post glacial reiver cuts down through the dam blocking the lake so that all the water drains away.

14. These striations are on rocks in the Indian Peaks Wilderness, Utah
These striations are on rocks in the Indian Peaks Wilderness, Utah. They were formed as individual particles carried at the base of a glacier moved across the bedrock and scratched the rock.
The striations provide important clues to the orientation of ice flow, particularly important if we were not around to observe the glacier when it existed.

15. Definition: rock hills shaped by the passage of ice to give  a smooth up-ice side and a rough, plucked and cliffed surface on the down-ice side. The upstream surface is often marked with striations.