Discussion
Arrange the features as per their occurrence from lower to higher altitude :
(1) Arete
(2) Medial Moraine
(3) Cirque
(4) Horn
Select the correct answer :
Answer: A
The order from lower to higher altitude is (2) (3) (1) (4): medial moraine, cirque, arete, horn.
A medial moraine is a ridge of debris carried down the middle of a valley glacier where two glaciers join, so it lies lowest, on the glacier in the valley. Cirques are armchair-shaped hollows at the head of the valley where the glacier starts. Where two cirques erode back to back, the sharp ridge left between them is an arete, and where three or more cirques cut into one peak they leave a pyramidal horn, such as the Matterhorn, at the summit.
The other orders put the horn or arete below the cirque or the moraine at the top, which reverses the glacial landscape.
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