In the zone of wastage or ablation in the lower reaches of a valley glacier or at latitudes farther from the poles in the case of continental glaciers, what processes cause the ablation?
Answer to relevant QuestionsWhat relationships between accumulation and ablation, as in Fig. 10.1, will cause a glacier to advance or retreat?How are icebergs a factor in sedimentation of glacial debris?What was removed from the rock exposure of Fig. 10.3 during abrasion by the overriding ice?On Fig. 10.4, how far did the glacier on the left advance? Give two lines of evidence.Define glacial till, and locate it on Fig. 10.5.
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