Rivers Four Processes of Erosion 2.0 / 5 based on 2 ratings ? GeographyWater and riversGCSE Created by: Paula BellCreated on: 16-11-09 11:26 Hydraulic action Physical force of water Vertical Erosion Normally happens in the upper course of the river 1 of 4 Attrition Stones and Pebbles reduce in size ---------------------> Upper Course ---------------------> Lower Course 2 of 4 Abrasion Stones and Pebbles drill downwards The movement of the washing in the machine is like the stones and pebbles 3 of 4 Solution Limestone dissolves into water eg. River Thames Process Rain poicks up CO2 Rain water becomes weak Carbonic Acid reacts with Calcium Carbonate Form calcium bicarbonate of dissoved limestone 4 of 4
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