(a) Look at Reference Diagrams Q3A and Q3B.

"The valley shown in Reference Diagram Q3B is typical of the lower course of a river."

Do you agree with the statement?

Give reasons for your choice. (4ES)

(b) The pupils in Reference Diagram Q3B are about to do a river study. What two techniques could they use to gather information about the characteristics of the river at AB on the sketch?

Justify your choices. (4ES)