The table below shows sediment collected from three points across a beach near a river mouth after a winter storm. Fig. 1 shows the sampling transect from t...

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

Question 1 Report

9230-p1-coast-beach-transect-4

The table below shows sediment collected from three points across a beach near a river mouth after a winter storm. Fig. 1 shows the sampling transect from the cliff to the low-tide mark. The pupils used callipers to measure the longest axis of 50 pebbles at each point. Sediment size can show how wave energy varies across a beach.

Point on transectMean pebble length (mm)Mean mass (g)
Backshore54126
Mid-beach3142
Near low-tide mark125

(a) Which point has the smallest mean sediment size? [1]
(b) Draw a bar chart to show mean pebble length at the three points. [2]
(c) Outline one reason why the largest pebbles are found on the backshore. [2]

Answer Details

(a) Near low-tide mark [1] (b) Award [1] for correctly scaled axes with units and three categories; [1] for bars at 54 mm, 31 mm and 12 mm (c) Strong swash can carry and deposit larger pebbles high on the beach [1]; finer material is more easily moved back downslope by backwash [1]

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