The movement of the glacier pulls these frozen rocks away. Abrasion – rocks trapped in the glacier rub against the valley floor wearing it away like sandpaper. Eroded material, such as rock ...

The banks of the St. Lawrence near Brockville, and all the Thousand Islands, have been rounded and montonnee by glacial abrasion during tlie period when all this mass of ice was moving southward ...

These originate from direct human activities on the glaciers, such as skiing or hiking, or are the result of activities in nearby settlements, such as rubber abrasion from car tires, which can be ...