File:PSM V55 D165 Sectional diagram of us side niagara river erosion.png
![File:PSM V55 D165 Sectional diagram of us side niagara river erosion.png](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/PSM_V55_D165_Sectional_diagram_of_us_side_niagara_river_erosion.png/800px-PSM_V55_D165_Sectional_diagram_of_us_side_niagara_river_erosion.png?20110601014028)
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