Ice On The Land Flashcards
What are the seven different landforms?
- arête
- pyramidal peak
- Corries
- truncated spurs
- hanging valleys
- glacial troughs
- ribbon lakes
What is an arête?
Steep-sided ridge when two glaciers flow in parallel valleys
What is a pyramidal peak?
Pointed mountain peak
What is a Corrie?
- ice moves due to rotational slip
- eroding steep sides into an armchair shape
- the the glacier melts it leaves a lake in the Corrie call a tarn
What is a truncated spur?
Cliff like edges on the side of the valley
What is a hanging valley?
- valleys formed by a small glacier, which flows into the main glacier,
- when the glacier melts it leaves a hanging valley
What is a glacial trough?
- Steep sided valley with a flat bottom.
* starts off as a v-shaped valley, changes into a u-shape as the glacier erodes the sides and the bottom
What is a ribbon lake?
• a long thin lake which forms after a glacier retracts.
What is the zone of accumulation?
Input of snow and ice onto the glacier (in the upper part)
What is the zone of ablation?
Output of the water from he glacier (in the Lower part)
What is positive glacial budget?
Accumulation (the input) excess the ablation (the output) which advances down the valley
What is negative glacial budget?
Ablation (the output) exceeds accumulation (the input) making he glacier get smaller and retracts up the valley
What is lateral moraine?
•material deposited where the side of the glacier was
What is medial moraine?
Material deposited in the centre of a valley where two glaciers meet
What is terminal moraine?
Material builds up at the snout, and is then deposited in semicircular mounds
