Remember C.A.S.H.
Corrasion (abrasion) = rocks scraping the river bed or banks.
Attrition=rocks suspended in the water
Solution=rocks dissolved by weak acidity in the river water.
Hydraulic Action=Fast moving water dislodge rocks.
Check page 115 of your textbook for the summary matrix at the bottom for reference.
Here is a animation link for you all to see:
http://cgz.e2bn.net/e2bn/leas/c99/schools/cgz/accounts/staff/rchambers/GeoBytes%20GCSE%20Blog%20Resources/Animations/rivererosion_njenkins.swf
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