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Form 3 Geography Topical Questions and Answers on Glaciation

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1. (a) What is an ice sheet?
Is large continuous mass of ice which covers vast areas of lowland
(b) Describe how an arête is formed
- Initially ice collects in shallow hollows on the mountain sides
- The hollows are enlarged by the plucking action of the ice to form cirques
- More ice accumulate in the hollows leading to further erosion
- The cirques recede until a knife edged rock called arête separates them.
(c) The diagram below shows types of moraines in a valley glacier
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