Continuous erosion on the outer bank and deposition on the inner bank forms a meander in the river, which will migrate downstream and change shape over time.Water moves slowly on the inside of the bend and the river deposits some load, forming a gently sloping river beach (also called a slip-off slope).The river erodes the outside bends through hydraulic action, corrasion and corrosion.This occurs on the outside of the bend and forms a river cliff. Water moving faster has more energy to erode.A corkscrew-like flow of water called Helicoidal Flow moves material from the outside of one meander bend and deposits it on the inside of the next bend.Once pools and riffles have developed, the river flows from side-to-side in a winding course.Riffles are areas of shallow water created by deposition of coarse sediment. Pools are areas of deep water and greater erosion (energy build-up due to less friction). This results in areas of slower and faster water movement.
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