Study Fig. 2, which shows a diagram of a river with a waterfall.

1. (a)(i)Add labels to Fig. 2 to show the position of: • plunge pool; • hard rock layer; • undercutting; • soft rock layer.[4]
2. (a)(ii)On Fig. 2, draw and label a future position of the waterfall.[1]
3. (b)(i)Which time period, A, B, C or D, had the fastest rate of erosion?[1]
4. (b)(ii)Which of the following could cause faster erosion at the waterfall? Tick two statements. Statement Increased rainfall in the area Increased speed of flow Low water volume Very hard rock Wider section of channel upstream Tick (✔)[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.