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river processes - igcse geography (process of erosion (hydraulic action,…
river processes - igcse geography
processes of transportation
traction
large rocks are rolled along the river bed
often at high discharge
saltation
smaller pebbles are rolled and bounced along the bed
suspension
smaller material is picked up and carried along without touching the banks or the bed of the river
process of erosion
hydraulic action
river banks have small cracks and crevices
the flow of water forces itself into the cracks compressing the air
the pressure widens the cracks and breaks away parts of the rock
attrition
two rocks crash into each other with forcs
the rocks break down into smaller, smother and rounder pieces
abrasion
rocks scrape along the bank, with a sandpaper affect
the rock erodes becoming smaller, rounder, and smoother
solution
rivers are slightly acidic
this causes carbonate rocks such as limestone to dissolve completely into the river water