Table 1 shows wind-speed readings collected at five heights above a dune in the Rub' al Khali. Fig. 1 shows the anemometer mast used in the investigation. T...

Assessment: Geography 9230 | Paper 1 Mock 01 | Written Paper 1 Subject: Geography - 9230

Question 1 Report

9230-p1-hotdesert-15-anemometer-mast

Table 1 shows wind-speed readings collected at five heights above a dune in the Rub' al Khali. Fig. 1 shows the anemometer mast used in the investigation. The team is studying why wind erosion is strongest near particular parts of a desert landscape.

Height above ground (m)Wind speed (m/s)
0.13.2
0.55.7
1.07.1
2.08.6
3.09.0

(a) Which height shown has a wind speed of 7.1 m/s? [1]
(b) Outline why wind speed is lower close to the ground. [2]
(c) Draw a labelled scale bar of 1 m beside the mast in Fig. 1. [2]

Answer Details

(a) 1.0 m [1] (b) Ground friction/roughness slows the air [1]; shrubs, stones or sand ripples create resistance/turbulence [1]. (c) A vertical or horizontal scale bar labelled 1 m, with sensible relative length beside mast [2]

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