River Abrasion – Rocks carried along by the river wear down the river bed and banks
In order to understand river abrasion you need to understand the word abrasion.
Abrasion – wear down or grind down.
You could hear the brays from (abrasion) the donkey as she wore down and ground down the corn.
So river abrasion is wearing down and grinding down a river's bed and banks.
Abrasion is when two surfaces rub against each other and attrition is where they bounce or smash against each other.
Abrasion is nibbling, scratching and scuffing.