Glaciers

3. a process of erosion involving the wearing away of the valley floor and sides
6. a finger of ice usually extending downhill from an ice cap and occupying a valley
8. slippage of ice along a curved surface
9. a sharp-edged mountain peak
10. a long narrow lake in the bottom of a glacier
11. a deep depression on a hillside with a steep back wall often containing a lake

1. a period of some 2 million years where global temperatures fluctuated considerably
2. a tributary glacial trough perched up on the wide of a main valley, often marked by a waterfall
4. a knife-edged ridge, often formed between two corries
5. an eroded interlocking spur characterised by having a very steep cliff
6. a period of ice advance associated with falling temperatures
7. a process of glacial erosion where individual rocks are plucked from the valley floor or sides