... my results. River basics Erosion Erosion is the breaking up of material. As the river moves through its course it changes from vertical to lateral erosion: There are four types of erosion> Hydraulic action - the river wears away the river bank from underneath.> Attrition - the rocks being carried by the river smash together and break into smaller particles.> Abrasion - the rocks carried along by the river wear down the river bed and banks.> Corrosion - the smaller particles are dissolved by the acidic river water. Stream order As a river develops its order of stream increases. This tells us how many tributaries have joined the river. A 2nd order stream has two tributaries, a 3rd order stream has four and a 4th order stream has 8 tributaries and so fourth. So when two 3rd order streams meet at a confluence a 4th order stream is created. Predictions and hypotheses With my knowledge ...

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