Turn over 11 3 (a) Study Figure 3 in the Resource Booklet. The student collected data about the different clast (sediment) size in the Upper layer and Middle layer of glacial till deposits at Aberogwen, North Wales, as part of an investigation about glacial deposition. (i) Complete Figure 3a below by adding the following data for the Upper layer. (1) Clast Size (cm) Number recorded 5.1–7.5 cm 11 15.1–17.5 cm 20 0 10 20 30 40 50 60 Number recorded 0–2.5 2.6–5.0 5.1–7.5 7.6–10.0 10.1–12.5 12.6–15.0 15.1–17.5 17.6–20.0 20.1+ Clast Size (cm) Upper layer Middle layer Figure 3a 12 (ii) The student decided to use a stratified sampling approach to collect their data. State two reasons why this could be an appropriate approach. 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(iii) Suggest one reason why the clast size in the Upper layer is different to that in the Middle layer. 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(iv) The student collected this data to investigate the differences between glacial sediment. Explain two other techniques the student could have used as part of their investigation. 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Turn over 13 (b) You have carried out secondary research to investigate glacial landscapes and change. Assess the value of secondary research in undertaking your geographical investigation. 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(Total for Question 3 = 18 marks)