The table below shows measurements made along a transect from a saline pan towards a low dune in a hot desert in Botswana. Fig. 1 shows the pan surface afte...

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

Question 1 Report

9230-p1-hotdesert-06-salt-pan

The table below shows measurements made along a transect from a saline pan towards a low dune in a hot desert in Botswana. Fig. 1 shows the pan surface after water evaporated. The fieldwork team noticed pale crusts on the ground and only scattered salt-tolerant plants.

Distance from pan centre (m)Soil salt content (%)Plant cover (%)
012.40
508.73
1004.112
1501.628

(a) Which site has the highest plant cover? [1]
(b) Outline why salt may be left on the surface of the pan. [2]
(c) Draw three small symbols on Fig. 1 to show where evaporation would leave a salt crust. [1]

Answer Details

(a) 150 m [1] (b) Water containing dissolved salts reaches the surface [1]; intense heat causes water to evaporate and salts remain [1]. (c) Three symbols placed on the flat cracked pan surface [1]

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