Explain the formation of meanders (4)

Meanders form in the lower regions of a river, where the river profile is flatter and the river bed is wide. There are 'ripples' and 'pools' which are shallow and deep parts of the river bed respectively. As the river runs faster in the pools it erodes the bed and, due to helicoidal flow, one side of the river bank and not the other. This forces the river to begin to bend. As this happens, the current bends with the river forcing a faster stretch towards the far embankment and a slower stretch on the inside of the bend. Where it is faster there is greater erosion, and on the inside of the bend there is deposition due to the slower current. This causes a greater bend and thus is how a meander forms.