(i) A Cirque
-Snow accumulates in a shallow pre-existing depression on a mountain side
-The snow gets compacted into ice to form a cirque glacier
-The ice erodes the bottom of the hollow by abrasion, making it deeper
-Frost action and the plucking process operate on the sides of the hollow, making it wider.
-The plucking process is effective on the back-wall, making it steeper
-Eventually, a deep arm chair-shaped depression is formed. This depression is called a cirque.
(ii) A hanging valley
-Initially, there is a main valley and tributary valleys
-Ice occupies these valleys
-The valleys get eroded by the ice through abrasion and plucking
-The main valley is eroded more because it contains more ice than the tributary valleys
-When ice eventually retreats by melting, the tributary valleys are left at a higher level than the main valley
-They appear to hang above it and so are called hanging valleys.
johnson mwenjera answered the question on February 22, 2018 at 15:54
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