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Rivers are powerful forces that can have a massive impact on peoples and landscapes, and so it is very important to understand their behaviour, so scientists can predict how they may change. This investigative program explains how traction, saltation, suspension and dissolved load can change the nature of a river. We look at the Hjulstrom Curve and its usefulness in plotting the movement of riverbed contents, the long profile of a river, and how geographical events like bogs and deltas pay a huge role in the formation and life of a river.