AQA · GCSE · Geography · Higher

Completing a River Dispersion Graph

Q04.9 1 mark

As part of a physical geography investigation a group of students wanted to test the following hypothesis.

The velocity (speed) of a river increases downstream.

The students used three sites along a river, one kilometre (km) apart. At each site a ball was placed in the centre of the river and the time recorded for it to travel ten metres (m). This was repeated five times at each site. Figure 6 shows the results of this part of the investigation.

Figure 6 – Time taken for ball to travel 10 m (seconds)

Site A – Upstream	Site B	Site C – Downstream
26	22	20
24	23	18
22	18	20
24	20	18
25	24	19

Average velocity (speed) (metres per second) = frac{text{Distance}}{text{Average time taken}}

Complete the dispersion graph below by filling in the missing data for Site C.

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Marking points

1 Adds one, and only one, Site C point on the 19-second horizontal line.

Why this answer loses marks

I plotted every Site C observation again.

Only the missing observation should be added; duplicating existing points changes the displayed data instead of completing it.