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i)Ice settles on several depression on a mountain
-Nivation, plucking and abrasion erode the sides and floor of the depression leading to the formation of cirques
-The backwalls of the cirques recede due to plucking leading to the formation of aretes
-The aretes converge at the mountain top forming a steep sided pyramidal peak.
ii) A main valley and it tributary exists in glaciated landscape
-Ice collects both the main valley and the tributary
-Erosion through abrasion, plucking and nivation occurs in both the main valley and tributary
-The main valley is eroded more because it has more ice than tributaries
-The main is deepened and widened through lateral and vertical erosion, leading to the formation of of a glacier trough
-Tributary valley that lies higher than the main valley forms a hanging valley.
Githiari answered the question on October 24, 2017 at 09:43
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